All Denver Health radiologists are board-certified by the American Board of Radiology and all have completed fellowships and other advanced training. We offer subspecialist reads that are informed by the latest medical research. Each radiologist completes extensive medical education annually. Our radiologists participate in educating the next generation of medical providers by teaching University of Colorado School of Medicine students, residents and fellows.
Over the years, multiple Denver Health radiologists have been named “Top Docs” by 5280 Magazine, including Denver Health physicians specializing in Neuroradiology, Pediatric Radiology, Nuclear Medicine and Interventional Radiology.
We follow industry best practices, including the use of standardized reports and reports with hyperlinks to key images. Our Picture Archiving and Communications System (PACS) is state-of-the-art, having recently been updated in 2019.
The ultimate goal of Denver Health radiologists is to provide imaging services reflecting the highest standards of clinical excellence delivered in a compassionate, caring and respectful environment.
Meet Our Team:
- Director
- Body Imaging
- Neuroradiology
- Musculoskeletal Imaging
- Breast Imaging
- Interventional Radiology
Director
David M. Naeger, M.D.
Director of Radiology
Professor and Vice Chair, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Cardiac and Thoracic Imaging, Nuclear Medicine
Dr. Naeger serves as the Director of Radiology at Denver Health, with oversight of the department’s clinical, research and educational programs. In his role as one of the institution’s Departmental Directors, he serves as part of the senior leadership team of the health system. Dr. Naeger also serves as a Professor and Vice Chair in the Department of Radiology at the University of Colorado School of Medicine.
Dr. Naeger earned his medical degree at Duke University School of Medicine, where he graduated AΩA (Alpha Omega Alpha), the most widely recognized honor society in medicine. After medical school, he moved to the University of California-San Francisco (UCSF) to complete his residency in Diagnostic Radiology, during which he served as a chief resident and was awarded the prestigious Elmer Ng Award. While at UCSF, Dr. Naeger completed a research fellowship and remained after his residency to complete clinical fellowships in Cardiac & Pulmonary Imaging and in Nuclear Medicine. After his fellowships, he was appointed to the faculty at UCSF, ultimately serving in a Departmental Associate Chair role, with a focus on Education, and the co-director of the Henry I. Goldberg Center for Advanced Imaging Education. In 2019, Dr. Naeger joined Denver Health as the Director of Radiology, and Professor and Vice Chair in the University of Colorado Department of Radiology.
At Denver Health, Dr. Naeger oversees a team of 150 FTE, including radiologists, technologists, RNs, transporters, clerks, and administrative staff. Denver Health performs nearly 300,000 imaging examinations per year at multiple in-patient and out-patient sites, including a recently opened state-of-the-art outpatient imaging center. Denver Health Radiology has undergone tremendous growth, overall and in targeted service lines, with an overall expansion of the complexity and variety of services offered. Denver Health radiology sponsors its own fellowship and is the largest affiliate rotation site for University of Colorado Radiology residents.
Dr. Naeger has consistently been honored for his excellence as a leader, researcher, and educator in radiology. Dr. Naeger has served in numerous leadership roles at Denver Health, at the University of Colorado, and at the University of California, San Francisco. Dr. Naeger is a member of 11 medical/radiology societies and holds 19 leadership roles including a Board of Directors membership and numerous committee chair roles; he also serves/served on executive committees and program planning committees. Dr. Naeger has served on grant review committees/study sections, including overseeing an educational granting program at the University of California, San Francisco. He currently is an associate/assistant/deputy editor for three journals, including top journals in the field, and is a reviewer for 9 additional journals. Dr. Naeger has served as a course director extensively throughout his career.
Dr. Naeger has given over one hundred invited international, national, and regional talks, including speaking in Taiwan, Hungary, the Netherlands, Brazil, and Canada. Many of Dr. Naeger’s talks were Grand Rounds given throughout the US.
Dr. Naeger holds a Fellowship of the Association of University Radiologist (FAUR) and is slated to join the Fellowship of the American College of Radiology (FACR) at the 2024 convocation. Dr. Naeger has won the prestigious UCSF Academic Senate Distinction in Teaching Award, which is given to only two institution UCSF faculty members per year. Dr. Naeger has been awarded the Society of Thoracic Radiology Presidents’ Award and has been inducted into the Academy of Medical Educators at both UCSF and the University of Colorado.
Dr. Naeger has authored 98 peer-reviewed manuscripts, 13 book chapters, and 65 abstracts. Dr. Naeger’s research and interests focus on novel curricular programs that enhance the education of medical students, residents, fellows and practicing radiologists. He has also conducted research on clinical considerations in the daily interpretation of radiologic images, with an emphasis on the imaging and diagnosis of lung cancer, lung biopsies, chest imaging and PET/CT imaging.
In his leadership service at Denver Health, the University of Colorado, and at UCSF, Dr. Naeger has a notable record of promoting diversity and inclusion policies and programming. Specifically, via his Department’s Diversity and Inclusion Committee, he has helped to improve access to mentored clinical and research experiences for historically underrepresented groups in radiology. As Associate Chair for Education, he promoted Diversity and Inclusion programming in all programs, including awareness of biases, barriers to inclusion, and the importance of diversity in our workforce.
Body Imaging
Elizabeth Dee, M.D.
Chief of Body Imaging
Clinical Instructor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Body Imaging
Dr. Dee graduated from the University of Virginia with her B.A. and M.D. Dr. Dee’s radiology residency and body imaging fellowship were completed at the University of Colorado where she was awarded the Outstanding Resident Teaching Award, the Outstanding Fellow Teaching Award, and the RSNA Roentgen Ray Research Resident/Fellow Award.
Dr. Dee is a Clinical Instructor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. During the course of her career, she has been awarded Denver Health’s Clinician of the Year Award, as well as being designated a “Top Doc” by 5280 Magazine, an honor bestowed on physicians in Denver.
Resident education in the area of body imaging and Denver Health’s Hepatobiliary Committee are two areas of particular interest.
She has been board-certified by the American Board of Radiology since 2003 and belongs to the Radiological Society of North America (RSNA), the American Roentgen Ray Society (ARRS), and the American College of Radiology (ACR).
Matthew Alfano, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Pediatric Imaging
Dr. Alfano is a Diagnostic Radiologist with expertise in general radiology and sub-specialty expertise in Pediatric imaging. At Denver Health, Dr. Alfano regularly attends imaging rounds with the PICU and NICU and enjoys working with residents in case conferences.
Dr. Alfano Graduated Magna Cum Laude from the University of North Dakota with an undergraduate degree in Aeronautics. He earned his medical degree from St. George’s University, where he graduated Magna Cum Laude. He also served as an anatomy instructor, was on the Dean’s List, and was an active member of the Iota Epsilon Alpha honor society. Dr. Alfano’s residency was completed at Dartmouth-Hitchcock Medical Center after an internship at Maimonides Medical Center. Dr. Alfano completed Fellowship in Pediatric Radiology at Boston Children’s Hospital. During Dr. Alfano’s residency and fellowship, he participated in research, proctored in the gross anatomy lab, and made trips to work in global health in Tanzania. He was awarded multiple teaching awards throughout his residency and fellowship. Dr. Alfano was awarded the prestigious John C. Stears Faculty Teaching Award in 2023.
Dr. Alfano holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine and particularly focuses on the education of residents/fellows in the area of Pediatric imaging.
Dr. Alfano is board-certified by the American Board of Radiology and sub-specialty board-certified in Pediatric Radiology.
Dr. Alfano belongs to multiple societies and has participated in global health programs. Dr. Alfano has been awarded “Top Doc” by 5280 Magazine, an honor bestowed on top physicians in Denver.
Vanessa Campbell, D.O.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Body Imaging
Dr. Campbell is a Diagnostic and Interventional Radiologist in Abdominal Imaging. Particular areas of clinical interests include advanced MRI of the prostate, genitourinary system, liver, biliary system, and pancreas. She focuses on image-guided body procedures such as tumor ablation and biopsies. She also specializes in cancer staging and follow up imaging.
Dr. Campbell earned her medical degree from Rocky Vista University College of Osteopathic Medicine with an honors certificate in Global Health. While at Rocky Vista she was awarded the TOUCH award for community service each year of medical school. She completed residency at Beaumont Hospital in Michigan, during which she won several annual resident research awards and was a speaker at the Radiological Society of North America Annual meeting. Dr. Campbell then moved to Harvard Medical School Brigham and Women’s Hospital to complete a fellowship in Abdominal Imaging and Intervention.
Dr. Campbell holds the title of Assistant Professor at Denver Health's academic affiliate, the University of Colorado School of Medicine. Dr. Campbell particularly focuses on the education of residents/fellows in the area of abdominal imaging and image-guided procedures.
Dr. Campbell is board-certified by the American Board of Radiology.
Dr. Campbell belongs to the Radiological Society of North America (RSNA), Society of Abdominal Radiology (SAR), American Roentgen Ray Society (ARRS), American Association for Women Radiologists (AAWR), and RAD-AID International.
J. Matthew Kerchberger, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Body Imaging
Dr. Kerchberger is a Diagnostic Radiologist with an expertise in the area of Body Imaging. Particular areas of clinical focus include hepatobiliary imaging, gastrointestinal imaging, genitourinary imaging, and emergency/ trauma imaging.
Dr. Kerchberger received his undergraduate degree in economics from Georgetown University where he graduated Summa Cum Laude, was inducted into the Phi Beta Kappa honor society, and received the B.J. Phoenix Award in economics. Dr. Kerchberger earned his medical degree from Emory University School of Medicine where he was a member of the Alpha Omega Alpha honor society. Dr. Kerchberger concurrently earned a Master of Public Health degree in Health Policy and Management from Emory’s Rollins School of Public Health where he was inducted into the Delta Omega honor society. Dr. Kerchberger’s residency was completed at the University of California San Francisco (UCSF) after an internship at Emory. Dr. Kerchberger also completed his Fellowship in Abdominal Imaging and Ultrasound at the UCSF. During Dr. Kerchberger’s residency, he received the Elmer Ng Outstanding Resident Award; and during his fellowship, he served as chief fellow.
Dr. Kerchberger holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. He is board-certified by the American Board of Radiology.
Dr. Kerchberger has been a co-author on multiple publications and has been a presenter at the Radiologic Society of North America (RSNA) Annual Meeting.
Nishant K. Mehta, M.D
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Body Imaging
Dr. Mehta is a Diagnostic Radiologist with an expertise in MRI. Particular areas of clinical focus include breast imaging and intervention and musculoskeletal MRI.
Dr. Mehta graduated summa cum laude from University of Southern California with a dual degree in Biomedical/Electrical Engineering. He received a USC Presidential Scholarship and was part of the Baccalaureate/MD program as an undergraduate student. Dr. Mehta attended the Keck School of Medicine at the University of Southern California where he was inducted into the Alpha Omega Alpha honor society. Dr. Mehta completed residency at Loma Linda University Medical Center in Loma Linda, California after an internship at St. Mary Medical Center in Long Beach, California. Dr. Mehta completed the prestigious Bradley MRI fellowship at UCSD Medical Center. During Dr. Mehta’s MRI fellowship, he had the opportunity to work with renowned subspecialty field leaders.
Dr. Mehta holds the title of Clinical Instructor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. Dr. Mehta particularly focuses on the education of residents/fellows in the area of breast imaging/intervention and musculoskeletal imaging.
Dr. Mehta is board-certified by the American Board of Radiology. He has been a member of the American Roentgen Ray Society (ARRS) and American College of Radiology. Dr. Mehta has been awarded “Top Doc” by 5280 Magazine, an honor bestowed on top physicians in Denver. In his free time, he enjoys mantra meditation, reading, and cooking.
Thanh Vu, M.D.
Clinical Instructor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Ultrasound, Body Imaging
Dr. Vu has been a member of the Department of Radiology at Denver Health since 2006. She received her undergraduate degree in religious studies and biology from University of Rochester in Rochester, N.Y. Dr. Vu’s medical degree was obtained from the University of Colorado School of Medicine. She completed a transitional internship at the University of Hawaii in Honolulu.
Her residency training and fellowship in body imaging both occurred at University of Colorado Health Sciences Center in Denver. She is board-certified by the American Board of Radiology. Dr. Vu holds the title of Clinical Instructor at Denver Health’s academic affiliate, the University of Colorado School of Medicine.
Graham Wallace, M.D.
Associate Professor of Clinical Practice, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Cardiothoracic Imaging, Body Imaging
Dr. Wallace is a diagnostic radiologist with an expertise in the area of cardiothoracic imaging. Areas of clinical focus include cardiac and vascular diseases, mediastinal, lung, and pleural diseases, oncologic imaging and trauma.
Dr. Wallace earned his medical degree at Kansas University Medical Center. He completed a Family Medicine Residency at the Scott Air Force Base – St. Louis University combined program and Diagnostic Radiology Residency at University of North Carolina Hospitals. Dr. Wallace completed a fellowship in Cardiac and Pulmonary Imaging at University of California San Francisco (UCSF).
As a career physician in the United States Air Force, Dr. Wallace served in many roles, including flight and family medicine, Family Practice Clinic Medical Director, radiology residency faculty, Chief of Radiology and as Chief of Medical Staff. In addition to stateside assignments, he has been stationed in South Korea, Italy, and England, as well as being deployed to Kuwait, South Korea and Afghanistan. He also served as volunteer faculty at University of California San Francisco for five years for which he was honored as the Outstanding Clinical faculty Member in Recognition of Teaching Excellence.
Dr. Wallace holds the title of Associate Professor of Clinical Radiology at Denver Health’s academic affiliate, the University of Colorado School of Medicine.
He is certified by the American Board of Radiology and belongs to the Society of Thoracic Radiology (STR), the American College of Radiology and the Radiologic Society of North America (RSNA).
Neuroradiology
Ashesh Thaker, M.D.
Chief of Neuroradiology
Associate Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Neuroradiology
Dr. Thaker serves as Chief of Neuroradiology and oversees clinical, research, and educational programs related to neuroimaging.
Dr. Thaker earned his medical degree from University of California, Los Angeles, with an additional dedicated year at the National Institutes of Health as a Howard Hughes Medical Institute research scholar. He completed a research track residency in diagnostic radiology at the University of Pennsylvania and a two-year fellowship in neuroradiology at University of California, San Francisco, where he served as chief fellow.
Prior to being recruited to Denver Health in 2023, Dr. Thaker practiced at University of Colorado Hospital and served in various leadership roles, including director of spine intervention and neuroradiology fellowship director. He is currently Associate Professor of Radiology at the University of Colorado School of Medicine where he educates students, residents, and fellows, and collaborates on neuroscience research. Dr. Thaker leads the neuroimaging core for the CU Alzheimer’s and Cognition Center and is a funded co-investigator on several NIH grants. He has published numerous peer-reviewed research articles with a focus on dementia and epilepsy; his complete bibliography can be viewed here.
Dr. Thaker is certified by the American Board of Radiology with additional subspecialty certification in neuroradiology. He is active in multiple local and national radiology societies, including the Colorado Radiological Society, American College of Radiology, and American Society of Neuroradiology.
Prior to pursuing medical training, Dr. Thaker grew up in Greeley and attended the University of Colorado Boulder on a Boettcher scholarship. He is an outdoor enthusiast, avid Colorado sports fan, and proud father of two boys.
John McMenamy, M.D., Associate Director of Radiology
Associate Professor of Clinical Practice, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Trauma, Emergency and Acute Care Radiology/Neuroradiology
Dr. McMenamy joined Denver Health in 2020 as the Associate Director of Service for Radiology at Denver Health, supporting the department’s clinical, research, and educational programs. He is an Associate Professor in the Department of Radiology at the University of Colorado School of Medicine.
Dr. McMenamy earned his medical degree at The University of Texas Medical School at Houston where he was class president. After medical school, he completed his diagnostic radiology residency at The University of Texas Southwestern (UTSW) in Dallas, during which he served as a chief resident. While at UTSW, he completed a neuroradiology fellowship, and he holds a Certificate of Additional Qualification (CAQ) in Neuroradiology, the highest level of certification offered by the American Board of Radiology in the subspecialty of Neuroradiology.
After completing neuroradiology fellowship, Dr. McMenamy joined NYU School of Medicine faculty, rising to the rank of Associate Professor and serving as Division Chief of Emergency Radiology where he oversaw the growth of the Emergency Radiology group from a single section of 6 members into a division with four sections comprised of 24 full-time faculty emergency radiologists covering multiple Level I trauma and stroke centers. He also served as the Director of Quality & Safety and Associate Director of High Reliability.
Dr. McMenamy is an experienced healthcare leader, educator, and mentor with an established track record of initiating and executing impactful quality, safety, and operational programs through robust performance improvement methodologies. Dr. McMenamy has a demonstrated ability to work effectively with leaders and physicians to create, engage, and lead diverse teams of front-line staff in accelerating achievement of institutional objectives. His training in these areas includes an MBA, a fellowship in Clinical Quality, Board Certification by the American Board of Medical Quality (CMQ), the highest level of lean training offered by NYC Health + Hospitals, and he has achieved Certified Physician Executive (CPE) status by the American Association for Physician Leadership.
Dr. McMenamy's academic interests focus on developing and executing programs to enhance quality, safety, and improvement education. While at NYU, he developed and led the radiology quality improvement curriculum and redesigned the NYC Health + Hospital clinician lean training program. His educational efforts involve all levels of experience, including medical students, residents, fellows, practicing physicians, NPs, PAs, RNs, and leaders throughout all areas of medicine. Dr. McMenamy has authored numerous peer-reviewed publications, presented dozens of quality- and safety-improvement project poster presentations, and was the recent recipient of 2020 American Society of Emergency Radiology - Neiman Health Policy Institute (ASER - NHPI) grant to improve healthcare system response to Mass Casualty Incidents (MCIs).
Mithun Diwakar, M.D., PhD
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Neuroradiology
Mithun Diwakar, MD, PhD is a Diagnostic Radiologist with an expertise in the area of Neuroradiology. Particular areas of clinical focus include traumatic brain injury, epilepsy, and functional neuroimaging (MEG).
Dr. Diwakar earned his Bachelor's of Science with honors from the California Institute of Technology (Caltech) in 2006. At Caltech, Dr. Diwakar was awarded the Stuart Foundation Upper Class Merit Award, the Carnation Merit Scholarship, and the Arie J. Haagen-Smit Memorial Award. Dr. Diwakar earned his Doctorate of Philosophy with honors in Bioengineering from the University of California San Diego (UCSD) in 2011. He earned his Doctorate of Medicine from UCSD in 2015 as well, after completion of the Medical Scientist Training Program. At UCSD, Dr. Diwakar was awarded the Department of Radiology Senior Student Award, the Dietschman Scholarship, and the Regent's Scholarship. Dr. Diwakar's transitional year internship was completed at the Harbor-UCLA Medical Center in 2016. Dr. Diwakar's residency was completed at the University of California San Francisco (UCSF) in 2020. Dr. Diwakar subsequently completed a fellowship in Diagnostic Neuroradiology at UCSF in 2021. During Dr. Diwakar's residency and fellowship, he was awarded a T32 research fellowship for pursuing research in the field of functional neuroimaging. Dr. Diwakar served as the residency program's webmaster from 2017-2019.
Dr. Diwakar holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. Dr. Diwakar particularly focuses on the education of residents in the area of emergency Neuroradiology.
He is board-certified by the American Board of Radiology. Dr. Diwakar belongs to the Radiologic Society of North America (RSNA) and the American Society of Neuroradiology (ASNR).
Dr. Diwakar has been actively interested in research throughout his professional career, with 18 peer reviewed publications and 2 poster presentations at national/international conferences.
Michael Mestek, M.D.
Associate Professor of Clinical Practice, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Neuroradiology
Dr. Michael Mestek earned his MD degree at the University of Colorado Medical School, which was followed by an internship at the University of New Mexico, a diagnostic radiology residency at the St. Joseph Hospital in Denver, and then a Neuroradiology fellowship at a Harvard-affiliated hospital.
Since training, Dr. Mestek has served thousands of radiology patients per year for over 40 years. While Dr. Mestek worked in a private practice briefly after his training, the majority of his career has been spent at Denver Health due to his keen interest in serving patients in need. When initially hired, Dr Mestek was the only fellowship-trained neuroradiologist at Denver Health, and a portion of his practice was neuroangiography. Dr Mestek has established expertise in all neuroradiology modalities, as well as in interventional radiology procedures and general diagnostic radiology examinations.
Over his career, Dr. Mestek served in a number of capacities, including head of the Dept from 1989 to 1997. During his leadership, Denver Health established its first independent interventional radiology service. Dr. Mestek was awarded the prestigious Medical Staff Career Service Award.
Dr. Mestek holds the title of Associate Professor of Clinical Practice at Denver Health’s academic affiliate, the University of Colorado School of Medicine and has taught hundreds of residents over his career. Dr. Mestek continues to attend on an intermittent basis and remains a highly valued and productive member of the team.
David Symonds, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Neuroradiology
Dr. David Symonds is a Diagnostic Radiologist with expertise in the area of Neuroradiology. Particular areas of clinical focus include trauma, stroke, and demyelinating disease.
Dr. Symonds graduated from the University of Washington, where he played in the marching band and was rush chairman for his fraternity. Dr. Symonds earned his medical degree from Cornell University. His residency was completed at the University of Colorado after an internship at Henry Ford Hospital. Dr. Symonds completed a fellowship in Neuroradiology at the University of Colorado.
Dr. Symonds holds the title of Clinical Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. He is board-certified by the American Board of Radiology in Diagnostic Radiology and Neuroradiology. Dr. Symonds belongs to the American Society of Neuroradiology (ASNR).
He is an avid birdwatcher and sings in a local chorus.
Musculoskeletal Imaging
Scott D. Tomsick, M.D.
Senior Instructor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Musculoskeletal Imaging
Dr. Tomsick has been a musculoskeletal radiologist in the Department of Radiology at Denver Health since 2010. Dr. Tomsick received his undergraduate degree in psychology from Duke University in Durham, North Carolina, and his medical degree from University of Cincinnati College of Medicine in Cincinnati, Ohio. He completed his internship at Good Samaritan Hospital in Cincinnati, Ohio, and his residency training at the University of Cincinnati, where he served as a chief resident. Dr. Tomsick’s fellowship in musculoskeletal imaging was undertaken at University of Colorado Health Sciences Center in Denver, Colorado during which he received the fellow teaching award.
Dr. Tomsick currently holds the title of Senior Instructor, Department of Radiology, University of Colorado School of Medicine. He is board-certified by the American Board of Radiology. Dr. Tomsick has coauthored various publications with a particular focus on musculoskeletal and spine disease/injury. In 2020, he was honored as a “Top Doc” in Denver by 5280 Magazine. In his spare time, Dr. Tomsick enjoys skiing, running, and playing music.
Sean Connor, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Musculoskeletal Imaging
Dr. Connor is a diagnostic radiologist in musculoskeletal imaging. Areas of clinical interest include sports MRI, trauma, and musculoskeletal ultrasound.
Dr. Connor received his undergraduate degree in biochemistry from the University of Denver. He earned his medical degree from Louisiana State University, where he graduated AΩA (Alpha Omega Alpha). After medical school, he completed his internship, radiology residency, and musculoskeletal fellowship at the University of New Mexico. During his training, Dr. Connor was awarded Intern and Fellow of the Year.
Dr. Connor has been a member of the American Roentgen Ray Society (ARRS), Radiologic Society of North America (RSNA), and Society of Skeletal Radiology (SSR). He enjoys the outdoors and spending time with his wife and three dogs.
Breast Imaging
Randy C. Miles, M.D.
Chief of Breast Imaging
Associate Director of Service for Radiology for Research
Associate Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Breast Imaging
Dr. Miles serves as the Chief of Breast imaging with oversight of the breast division’s clinical, research, and educational programs. He also serves as the Associate Director for Research in the Radiology Department.
Dr. Miles earned his medical degree from Mayo Clinic College of Medicine, where he was awarded the Miller Award for Humanitarianism related to his work leading medical mission trips to Haiti and the Dominican Republic. He also completed his Master’s in public health degree from Harvard School of Public Health during medical school, where he was selected as a Zuckerman Fellow. He completed his diagnostic radiology residency training at the University of Illinois- Chicago, where he served as chief resident, and completed his breast imaging fellowship training at the University of Washington Medical Center / Seattle Cancer Care Alliance.
Dr. Miles was recruited to Massachusetts General Hospital and Harvard Medical School following his fellowship training, where he served a variety of leadership roles, including education director and clinical service chief of breast imaging. As clinical service chief, he oversaw the division’s same-day care program, led implementation of contrast-enhanced mammography, and initiated numerous health equity initiatives.
Dr. Miles has been the recipient of numerous research grants, including the AUR GERRAF fellowship, RSNA Research & Education Foundation Education Development Imaging Cancer Grant, MGH Cancer Center and the Center for Innovation in Early Cancer Detection (CIECD) Award, Harvard Catalyst Faculty Fellowship, and The Eleanor and Miles Shore 50th Anniversary Fellowship Program (HMS) Award. Over his 4 years at MGH, Dr. Miles published nearly 50 academic papers and gave numerous talks nationally on his work in artificial intelligence, health literacy, and breast cancer disparities.
Dr. Miles’ educational efforts have involved trainees at all levels of experience, including medical students, residents, fellows, medical technologists, physician extenders, and attending physicians. He was awarded Teacher of the Year Award by residents during his time at MGH. He has also worked in Shanghai, China as a consultant, providing expertise on how to improve operational efficiency and patient experience in a breast imaging practice.
At Denver Health, Dr. Miles’ clinical, research, and public health efforts will center around using innovation to: 1) identify barriers to breast cancer screening, 2) create patient-centered initiatives to improve access to breast imaging services, and 3) examine how to improve delivery of high-quality, guideline-concordant breast care for all patients.
Dr. Miles holds the title of Associate Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine.
Christopher Doyle, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Breast Imaging
Dr. Doyle is a Diagnostic Radiologist with an expertise in breast imaging. He graduated from The University of Cincinnati College of Medicine, where he was admitted to the Arnold Gold Humanism Honors Society. He then completed his residency at the University of Chicago Hospitals after an internship in internal medicine at The Christ Hospital in Cincinnati Ohio where Dr. Doyle was presented the Larry Otto Family Centered Care Award. Dr. Doyle completed fellowship in breast imaging at Columbia University Medical Center /New York Presbyterian.
Dr. Doyle holds the title of assistant professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. He focuses on the education of residents and fellows in the area of breast cancer screening, diagnostic mammography, and breast intervention.
He is board certified by the American Board of Radiology and belongs to the Radiological Society of North America (RSNA), Society of Breast Imaging (SBI), and American College of Radiology (ACR).
Nhat-Tuan Tran, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Breast Imaging, Body Imaging
Dr. Tran is a Diagnostic Radiologist with an expertise in the area of Breast Imaging. Particular areas of clinical focus include health disparities research, as well as community outreach.
Dr. Tran graduated from the University of Colorado Denver in Accounting and Biology. Dr. Tran earned his medical degree from the University of Colorado School of Medicine where he received the Adler Scholarship. Dr. Tran’s residency was completed at the University of Colorado after an internship in surgery at St. Joseph's Hospital in Denver. Dr. Tran completed his Fellowship in Breast Imaging at the University of Colorado.
Dr. Tran holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. Dr. Tran particularly focuses on the education of residents and fellows in the area of health disparities, community outreach, and breast imaging.
Interventional Radiology
Eric Aaltonen, M.D.
Chief of Interventional Radiology
Clinical Associate Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Interventional Radiology
Dr. Aaltonen is an Interventional Radiologist (IR) with a clinical focus including interventional oncology and portal hypertension. At Denver Health, Dr. Aaltonen is the IR Chief and serves on the Credentialing and Procedural Sedation committees. Dr. Aaltonen graduated magna cum laude from Princeton University earning a degree in chemical engineering with a focus on engineering biology. Dr. Aaltonen earned his medical degree from Northwestern University Feinberg School of Medicine and concurrently a Master of Public Health degree from the Northwestern University Graduate School. He began residency training in diagnostic radiology at the University of Illinois, Chicago where he was named a chief resident during his second year prior to completing residency training at New York University.
Dr. Aaltonen completed his vascular and interventional radiology fellowship at University of California San Francisco in 2013. Dr. Aaltonen holds the title of Clinical Associate Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine and is board-certified by the American Board of Radiology. Dr. Aaltonen’s research and education interests include quality and operational optimization.
Dr. Aaltonen belongs to the Society of Interventional Radiology (SIR) and has served on the interventional oncology service line, association of IR program directors, and association of IR chiefs. Prior to joining Denver Health, Dr. Aaltonen practiced at NYU Langone Health where he served as IR fellowship and residency program director and was co-primary investigator for a multi-year Agency for Healthcare Research and Quality grant, focusing on the inpatient IR experience.
Stephen Dreyer, MD, MBA
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Interventional Radiology
Dr. Stephen Dreyer is an Interventional Radiologist with an expertise in the area of image-guided procedures. His areas of clinical focus include trauma, dialysis access creation and maintenance, and interventional oncology.
At Denver Health, Dr. Dreyer serves on the Trauma Council, as well as participates in many multi-disciplinary boards throughout the hospital.
Dr. Dreyer graduated from the University of Texas with a degree in biochemistry. He earned his medical degree from Baylor College of Medicine where he simultaneously completed a Master of Business Administration at Rice University. Dr. Dreyer’s internship and residency were completed at University Hospitals Case Medical Center. Dr. Dreyer completed his fellowship in Vascular and Interventional Radiology at M.D. Anderson Cancer Center. He is board-certified by the American Board of Radiology.
Dr. Dreyer holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. Dr. Dreyer particularly focuses on the education of residents and fellows in the area of interventional radiology.
Adam Schwertner, M.D.
Assistant Professor, Department of Radiology, University of Colorado School of Medicine
Subspecialty Focus: Interventional Radiology
Dr. Schwertner is an Interventional Radiologist with an expertise in the area of Vascular and Interventional Radiology. Particular areas of clinical focus include interventional oncology and dual-energy CT applications within Interventional Radiology.
Dr. Schwertner graduated from the University of Iowa with an undergraduate degree in Biomedical Engineering. Dr. Schwertner was a presidential scholar while at the University of Iowa. He earned his medical degree from the University of Chicago Pritzker School of Medicine where he graduated with Alpha Omega Alpha honors. Dr. Schwerner’s residency was completed at the University of California, San Francisco, after an internship at the University of Chicago, North Shore. Dr. Schwertner completed Fellowship in Vascular and Interventional Radiology at the University of California, San Francisco. During Dr. Schwerner’s residency, he performed research and gave national presentations on the new training pathway in Interventional Radiology.
Dr. Schwertner holds the title of Assistant Professor at Denver Health’s academic affiliate, the University of Colorado School of Medicine. Dr. Schwertner particularly focuses on the education of residents, fellows, and PA Students in the area of image-guided procedures and Interventional Radiology.
He is board-certified by the American Board of Radiology. Dr. Schwertner belongs to the Society of Interventional Radiology (SIR) and the Radiological Society of North America (RSNA).
At Denver Health, Dr. Schwertner serves as the site director for a medical student rotation in Interventional Radiology for medical students from the University of Colorado School of Medicine.
Dr. Schwertner has a number of research interests with highlighted recent publications listed below:
- Schwertner A, McMenamy J, Naeger DM. Radiology Imaging Volume Changes During Discrete COVID-19 Pandemic Waves: Implications for the Delta Variant of Coronavirus and Future Pandemics. J Am Coll Radiol JACR. Published online November 23, 2021:S1546-1440(21)00918-2. doi:10.1016/j.jacr.2021.09.045
- Glencer A, Kirkwood K, Schwertner A, et al. Multidisciplinary Management of Postoperative Pancreatic Fistula. Dig Dis Interv. 2021;05(01):055-069. doi:10.1055/s-0040-1721785
- Schwertner A, Kohlbrenner RM, Seeley EJ, Lokken RP. Nonfibered Packing Coil Embolization of Pulmonary Artery Pseudoaneurysm Resulting in a Delayed Endobronchial Coil Migration. J Vasc Interv Radiol. Published online January 2021. doi:10.1016/j.jvir.2020.12.026
When not practicing as an Interventional Radiologist, Dr. Schwertner enjoys skiing, gardening, and golfing.