He completed a residency in internal medicine at New York-Presbyterian/Queens, where he was Chief Resident, and then received fellowship training in nephrology and hypertension there. Dr. Thomas joined the faculty at UT Southwestern in 2012, where he has been Medical Director of the Division of Hospital Medicine at UT Southwestern University Hospitals since 2013. Dr. Thomas has been selected to serve as a mentor for medical students in UT Southwestern's Seldin College.