evidence: Stephen Michael Hahn (born January 22, 1960) is an American physician who served as the commissioner of food and drugs from 2019 to 2021. Before becoming commissioner, he was an oncologist serving as chief medical executive of the MD Anderson Cancer Center. In 2021, he became chief medical officer at Flagship Pioneering, the venture capital firm that launched Moderna. [...] - ^ "Stephen M. Hahn, M.D." The Trustees of the University of Pennsylvania. Archived from the original on 2016-03-22. Retrieved 2019-10-03. [...] - ^ a b c d "Stephen Hahn: Pancoast Professor of Radiation Oncology". University of Pennsylvania Almanac. 52 (4). September 20, 2005.