Thomas earned his medical degree from the University of Mainz in Germany. He completed his residency and fellowship within the Department of Endocrinology and Metabolism, at the University of Heidelberg, Germany. Thomas completed a postdoctoral fellowship within the Department of Cell Biology at Yale University, New Haven. Following his postdoctoral fellowship, Thomas accepted a position as Associate Professor Endocrinology and Metabolism at the University of Bochum, Germany. Before he joined Boehringer Ingelheim in 2011, he worked in the USA for over 5 years in the area of Drug Development and Medical Affairs within the cardiometabolic field at Merck.