The 4 years that Michel Hersen spent at the University of Mississippi Medical Center (1970-1974) are described in this article from the viewpoint of his place in the history of the development of behavior analysis and therapy. The Department of Psychiatry at the University of Mississippi Medical Center became a leader in enhancing the role of psychologists as clinician researchers within psychiatry and applying basic findings from psychology to the bedside. A vigorous research program involving psychology residents and postdoctoral students, and psychology and psychiatry faculty emerged from this integration of science and practice. Many of the faculty members, including Michel Hersen, became leaders in the field of behavior therapy. Much of what was groundbreaking at the time is now commonplace within many medical schools. (Contains 1 figure.)