Hans Breiter served on the faculty of Harvard Medical School from 1993 to 2011, achieving the rank of associate professor.

During his post-graduate training and early faculty career at Massachusetts General Hospital and Harvard Medical School, Breiter gained advanced research training by completing a National Institutes of Health-sponsored postdoctoral fellowship in nuclear magnetic resonance research, a Ethel Dupont-Warren Research Fellowship in experimental psychology, and a DANA Foundation Fellowship in Neurobiology.