Meet our Texas Diabetes Institute Executive Team

Ralph DeFronzo, MD

Ralph A. DeFronzo, MD

Ralph A. DeFronzo, MD serves as Deputy Director of the Texas Diabetes Institute. As one of the nation’s leading diabetes researchers, Dr. DeFronzo is also a Professor of Medicine and Chief of the Diabetes Division at the UT Health San Antonio and the South Texas Veterans Health Care System, Audie L. Murphy Division in San Antonio. He is a graduate of Harvard Medical School and served his Residency in Internal Medicine at Johns Hopkins Hospital. He has completed fellowships in endocrinology at the National Institutes of Health/Baltimore City Hospitals, and in Nephrology at the Hospital of the University of Pennsylvania.

Theresa De La Haya, RN, BSN, MPH

Theresa De La Haya, RN, BSN, MPH

Theresa De La Haya, RN, BSN, MPH serves as Vice President of the Texas Diabetes Institute. She earned her Bachelor of Science degree in nursing from the UT Health San Antonio Nursing School, and a Masters in public health from the UT Health Science Center at Houston, School of Public Health.

 

Angela Casias, RN, MSN

Angela Casias, RN, MSN

Angela Casias, RN, MSN serves as Executive Director of the Texas Diabetes Institute. She earned her Bachelor of Science degree in nursing from the University of the Incarnate Word, and a Masters in nursing administration from the UT Health San Antonio.

 

Aruna Vankatesh, MD

Aruna Venkatesh, MD

Aruna Venkatesh, MD serves as UMA Medical Director at the Texas Diabetes Institute (TDI) where she has been an endocrinologist since 2000. She currently supervises endocrine, internal medicine and family practice physicians, nursing and clerical staff at TDI and a satellite endocrine north clinic.

Dr. Venkatesh completed her fellowship in Endocrinology, Diabetes and Metabolism from UT Southwestern following her residency in Internal Medicine at the University of Hawaii and medical schooling at Osmania Medical College, India.

Besides patient care and teaching, she is passionate about promoting healthy styles in the community. She is the San Antonio Physician leader for the national Walk with a Doc program. She is board certified in internal medicine and board certified and recertified in endocrine, diabetes, and metabolism.

Dr. Jane Lynch, MD Medical Director of the Children's Center at Texas Diabetes Institute

Jane L. Lynch, MD

Dr. Jane Lynch, MD serves as the Medical Director of the Children's Center at the Texas Diabetes Institute and as an Assistant Professor/Clinical in the Department of Pediatrics at the UT Health San Antonio. She received a Bachelor's of Science in microbiology from Indiana University in Bloomington, Indiana. She received her medical degree from Wright State University School of Medicine in Dayton, OH.

Eugenio Cersosimo, MD

Eugenio Cersosimo, MD

Eugenio Cersosimo, MD is currently the Medical Director of Clinical Research at the Texas Diabetes Institute and an Associate Professor of Medicine at the UT Health San Antonio. He obtained his medical degree at the Universidade Federal Fluminense in Rio de Janeiro, Brazil and moved to Vanderbilt University in Nashville, Tennessee where he graduated with a Ph.D. in physiology and metabolism. He served his medical residency training and endocrinology fellowship program at the Mayo Clinic in Rochester Minnesota with a special degree in clinical investigation.