Benoit Mulsant, MD, is The Centre for Addiction and Mental Health's Physician-in-Chief as well as the Clinical Director of the Geriatric Mental Health Program in the Clinical Research Department. He is a Professor in the Department of Psychiatry with the Faculty of Medicine at the University of Toronto.

Dr. Mulsant has been designing and conducting clinical trials for "hard–to-treat" older patients with mood disorders for more than 15 years. He is concerned about the demographics of an ageing population and the urgency to improve the treatment of seniors with severe mental disorders. He is one of the principal investigators of two major studies: a large placebo-controlled study to investigate the efficacy and tolerability of a combination of a newer antidepressant and an atypical antipsychotic for the treatment of psychotic depression; and the first randomized clinical trial to investigate the efficacy and tolerability of drug therapy for bipolar disorder in late life. In addition, Dr. Mulsant is assessing the nature and course of cognitive impairment in older patients with a psychiatric disorder. He is also involved with a pilot project that uses PET-imaging to investigate how to improve the treatment of late-life schizophrenia.