The University of California at San Francisco has fired its medical-school dean, David A. Kessler, after a months-long dispute over what he says were “financial irregularities” at the medical school that dated from before his appointment four years ago.

Dr. Kessler, a former commissioner of the U.S. Food and Drug Administration, was fired Thursday, according to The Washington Post. The medical school’s Web site carried statements from both Dr. Kessler and the university’s chancellor, J. Michael Bishop.

The university said it had conducted three investigations into Dr. Kessler’s allegations of irregularities, and concluded that the allegations were unjustified. But Dr. Kessler told The New York Times: “Everyplace I have had the privilege of being a part of has wanted, when it sees a problem, to get to the bottom of it, but that was not the case here.”

Dr. Kessler, who is a tenured member of the university’s faculty, said he would stay and teach. —Lawrence Biemiller