CHS Management Team

Simon Hambidge, MD, PhD Simon Hambidge

Ambulatory Care Services Officer

CEO, Denver Community Health Services

Dr. Hambidge is Chief Ambulatory Officer at Denver Health and Chief Executive Officer of Denver Community Health Services (DCHS). A pediatrician by training, Dr. Hambidge was previously the Director of General Pediatrics for Community Health Services for 8 years. He is a Professor of Pediatrics at the University School of Medicine, and has practiced at Denver Health since 1997.

As DCHS Director, Dr. Hambidge oversees a network of 9 community health centers and 17 school-based clinics, which provide health care to over 150,000 patients, approximately one-fourth of the population of Denver. Denver Health’s patients include over half of the Medicaid patients in the city. 

Dr. Hambidge still provides limited clinical care in the Webb Center for Primary Care’s Kids Care clinic. He has published numerous articles on topics such as vaccine safety and pediatric obesity.

Dr. Hambidge serves on the Board of Directors of the Denver Health Medical Plan, the Colorado Community Health Network, the Community Health Association of Mountain and Plains States, the Northeast Denver Initiative, and Reach Out and Read Colorado.

Ray Estacio, MD Ray Estacio

ACS Associate Medical Officer & ACS QI Director

Ray Estacio, MD is the Ambulatory Care Services Associate Medical Director for Quality and Research whose responsibility is to improve healthcare delivery to Denver Health patients.  Dr. Estacio a general internist and is a primary care physician at the Westside Family Health Center’s Adult Clinic. He graduated from Indiana University School of Medicine and completed General Internal Medicine training at the University of Colorado Health Sciences Center.

Dr. Estacio’s research projects focus on interventions to improve racial/ethnic disparities in diabetes and cardiovascular disease. His research career has included participation in a number of NIH and industry-sponsored prospective randomized clinical trials in diabetes, hypertension and CV disease over the past 20 years. This includes leadership roles in projects examining strategies to improving healthcare delivery which have been funded by NIDDK, NHLBI, AHRQ and American Diabetes Association.  He also serves as Director of Community Health Programs for the Colorado Prevention Center (CPC) for the past three years. The CPC programs focus on promoting cardiovascular health through screening and education. These programs have been implemented in over 25 Colorado counties and are funded by a number of sources including local and national foundations and state and federal grants.

Rachel Everhart, MS, PhD Rachel Everhart

Director, ACS Data and Analytics

Rachel directs the clinical and operational data management, analysis and reporting for the Ambulatory Care Services department at Denver Health. Dr. Everhart is involved in program evaluation for various grant-funded programs focused on improving the healthcare access, utilization, and quality of Denver’s medically underserved population. She gained experience working with and advocating for underserved populations through a year of service as an AmeriCorps VISTA. Dr. Everhart earned her PhD in Health Services Research from the University of Colorado at Denver and Health Sciences Center and holds a MS in Clinical Epidemiology and Health Services Research from Wake Forest University. She enjoys sharing the blend of urban and mountain amenities that Denver allows with her husband, two children, and Greater Swiss Mountain dog.

Steve Federico, MD Steve Federico

Director General Pediatrics, SBHCs and Community Programs 

Dr. Federico is the Director of Outpatient Pediatrics and Director of School and Community Programs at Denver Health. Dr. Federico is an Associate Professor of Pediatrics at the University of Colorado School of Medicine and a practicing pediatrician at the Montbello Family Health Center and several school-based health centers. He received his undergraduate degree from the University of Arizona and his medical degree from the University of Arizona School of Medicine. He completed his Pediatric residency, a certificate in public health and a Primary Care Research Fellowship through the University of Colorado School of Medicine. He is a physician advocacy fellow at the Institute for Medicine as a Profession and served as President for the Colorado Chapter of the American Academy of Pediatrics from 2010-2012. His academic interests include physician advocacy, health disparities, school health and health policy.

Deb Gardner, BSN, MSN Deb Gardner

Assistant Chief Nursing Officer

Deb has a BSN, Cum Laude, from the University of Colorado and MSN, Honors, from Regis University. She has worked as nurse for more than 25 years in a variety of staff and leadership roles. Deb came to Denver health in 1999 as staff nurse in the hospital.  Deb is a Board Certified Nurse Executive from American Nurses Credentialing Center.

Rebecca Hanratty, MD Rebecca Hanratty

Director General Internal Medicine

Dr. Hanratty is the Director of General Internal Medicine and is an Associate Professor of Medicine at the University of Colorado School of Medicine. She is a practicing physician at the Eastside Family Health Center. Dr. Hanratty received her undergraduate degree from the University of Notre Dame, her medical degree from the University of Colorado and did her Internal Medicine residency at the University of Colorado Health Sciences Center. Her research interests include health disparities, cardiovascular disease and chronic kidney disease.

Don Kirkpatrick, MD, AGAF Don Kirkpatrick

Director Medical Specialty Services

Dr. Kirkpatrick is the Associate Director of Service for Medical Specialties. A clinical gastroenterologist at Denver Health and Fellow of the American Gastroenterological Association, his administrative duties are focused on improving access to the specialty clinics. He graduated from Washington University School of Medicine, completed internal medicine residency at the University of Arizona, gastroenterology fellowship at the University of Wisconsin, and will finish a masters in healthcare management from Harvard University in 2018. When not involved in medical pursuits, he can be found practicing his violin at home or at the Evergreen Off Leash Dog Park with the family’s two Australian Shepherds.

Lucy Loomis, MD MSPH Lucy Loomis

Director Family Medicine

Dr. Loomis is the Director of Family Medicine at Community Health Services, where she oversees the operations of five family health centers providing over 90,000 visits a year to patients of all ages, as well as the academic practice of family physicians in at Denver Health. She practices full scope family medicine, including maternity care, seeing patients at Lowry and La Casa Family Health Centers. 

Dr. Loomis is the founding Director of the Denver Health track of the University of Colorado Family Medicine residency, which has successfully placed graduates in community health centers and other underserved settings.  She has also been active in organized medicine, including board membership on the Denver and Colorado Medical societies. She was president of the Denver Medical Society from 2011-12. Dr. Loomis received a B.S. in Biology from Yale University, her medical degree from Case Western Reserve University, residency in Family Medicine at the University of Connecticut and a master’s in public health from the University of Colorado, Denver.  She is board certified in Family Medicine and General Preventive medicine, and is an associate Professor of Family Medicine and Preventive Medicine.  Her research interests include practice improvement, cancer screening, women’s health, and residency training in the health center environment.

Kathryn Witzeman, MD, FACOG Kathryn Witzeman

Director ACS Women's Health

Dr. Witzeman is the Associate Director of Women’s Health for Ambulatory Care Services. She is an Associate Professor in the Department of Obstetrics and Gynecology at the University Of Colorado School of Medicine. Dr. Witzeman has a strong interest in women’s preventative health. In 2008, Dr. Witzeman founded the Women's Integrated Pelvic Health Program at Denver Health Medical Center and has overseen its growth and development as its Director since inception. She is a Fellow of the American College of Obstetrics and Gynecology and her clinical and research interests include vulvovaginal disorders, pelvic pain, menstrual disorders, menopausal problems, biomedical ethics as it applies to the field of OBGYN and medical education. Dr. Witzeman speaks nationally and internationally on these topics.  Dr. Witzeman was voted onto the Executive Board of Directors of International Pelvic Pain Society in 2016. Dr. Witzeman recently graduated from the University of Arizona Fellowship in Integrative Medicine.  Dr. Witzeman has also completed the 2012 APGO Scholars and Leaders program. She completed her medical degree at the University of Cincinnati SOM and her OBGYN residency training at the University of North Carolina, Chapel Hill. In her spare time, she enjoys hiking, cycling, skiing, organic gardening and getting out into the beauty that Colorado offers.

Jen Grote Jen Grote

Director Integrated Behavioral Health

Dr. Grote is the Director of Integrated Behavioral Health and is an Instructor of Medicine at the University of Colorado School of Medicine.  She is a practicing psychologist at the Westwood Family Health Center.  Dr. Grote received her undergraduate degree in psychology from Miami University, her master’s degree in counseling from Loyola University Chicago, and her doctorate degree in Counseling Psychology from the University of Denver.  She completed her pre-doctoral internship and post-doctoral fellowship at Denver Health.  Dr. Grote is in the RIHEL PCMAC fellowship program class of 2019 for leadership and advocacy.  Her research and academic interests include provider resiliency, leadership, health policy and payment reform for behavioral health services.  She enjoys spending time with her family in the Colorado outdoors and baking.

Tracy Johnson, PhD Tracy Johnson

 Director Healthcare Reform

Dr. Tracy Johnson joined Denver Health and Hospital Authority (DH) in 2010 as special assistant to the CEO, responsible for assisting DHHA with the implementation of federal health care reform, especially in the areas of delivery system and payment reform.  Upon receiving a $20 million CMS Health Care Innovation Award focused on transforming DH primary care practices, Dr. Johnson transitioned to Ambulatory Care Services where she serves as Director of Health Care Reform Initiatives.  During 2016-17, she received a Commonwealth Fund Australian-American Fellowship (2016-17) and spent a year in Sydney, Australia where she focused on predictive risk modeling associated with primary care reforms in New South Wales.  Previously, she has worked at the state Medicaid agency and has served as president of Health Policy Solutions, Inc (HPS).  HPS is a Colorado-based consulting firm that specialized in health policy analysis, health services research and evaluation.  Dr. Johnson holds a Ph.D. in Health Policy and Management from the Johns Hopkins School of Hygiene and Public Health (1998) and an M.A. in Bioethics from the University of Virginia (1992).

Haddas Lev, MS, MBA, RN Haddas Lev

Director, Ambulatory Care Services Operations

COO, Denver Community Health Services

Haddas is the Director of Operations for Ambulatory Care Services.  She earned a Bachelor of Science in Engineering from the University of Massachusetts, and a Master of Science in Operations Management and MBA from Rensselaer Polytechnic Institute.  She began her career in healthcare while completing a year of service as an AmeriCorps HealthCorps member working with the underserved and underinsured population at a Colorado Community Health Center.  The focus of her work at Denver Health and Ambulatory Care Services has been on process improvement, facility design and construction, patient access, and growth and expansion strategy.

In her spare time, Haddas enjoys all of the wonderful outdoor activities that Colorado has to offer.  

Rafael Troche Rafael Troche

Director ACS Finance

Rafael is the Director of Finance for Ambulatory Care Services. He has spent his entire career working in the healthcare industry on both the provider and payer side. Moving from Boston to Colorado in 2012, Rafael has held many different financial roles at Denver Health and has served in his current capacity since 2015. He graduated from Boston College with a Degree of Science in Accounting. Enthusiastic supporter of the mission at Denver Health, Rafael enjoys maximizing every opportunity to ensure that the highest quality of care is delivered in the most cost effective manner. In his free time, he enjoys travelling and taking full advantage of all of the wonderful outdoor activities the state of Colorado has to offer. 

Duane Mata, DDS Duane Mata

Director Community Dental Services

Dr. Mata is the Director of Community Dental Services at Denver Health. Previously he was the dental team lead at Westside Family Health Center. Dr. Mata continues to provide clinical care two days a week at Denver Health and has practiced dentistry for over 17 years in private offices in the Northern Colorado and southeastern metro Denver areas. He is a true Denver native, born and raised. He received his undergraduate degree from the University of Denver and is a 2001 graduate of the University of Colorado School of Dentistry. Dr. Mata has supported and helped to integrate Dental services into the Women’s Care Clinic at Westside Family Health Center by partnering with the Delta Dental of Colorado Foundation CO-MDI program and the CDPHE Oral Health Partnership initiative. He oversees 6 community health dental clinics, 17 school-based clinics, and management and development of the new Outpatient Medical Center (OMC) Dental Clinic increasing our capacity for services with 30 new dental operatories set to open in spring 2020. Dr. Mata is married to his high school sweetheart and has three children.