Dr Thumar completed his residency (Internal Medicine) from Civil Hospital, Ahmedabad, India. During his medical training at Gujarat Cancer Research Institute he developed major interest in medical oncology and basic science research. He served as post doctoral research fellow at Center for Vascular Biology, University of Connecticut. He completed his additional internship and residency training in internal medicine at University of Connecticut, Farmington, CT. He served as Chief Medical Resident at John Dempsey Hospital, Farmington, CT. He then served as a Fellow in Hematology and Oncology at Yale Cancer Center, New Haven, CT.