Dr. Petersen is the director of Psychology Education in the division of Postgraduate Medical Education in the Psychiatry Department at Massachusetts General Hospital, and spearheads development and implementation of the MGH Psychiatry Academy’s interactive online courses on cognitive behavioral therapy.
Dr. Petersen served as a cognitive therapist and project coordinator for the seminal NIH Sequential Alternatives to Relieve Depression (STAR*D) investigation and was the principal investigator for an investigation sponsored by a Young Investigator Grant received from the National Alliance for Research on Schizophrenia and Depression (NARSAD).
Dr. Petersen's clinical specialty is cognitive behaviorally based interventions for difficult-to-treat mood disorders. As part of his research work, he has been involved in developing various evidence-based psychotherapy treatment manuals. Dr. Petersen is active in providing clinical and research supervision to MGH psychology interns and psychiatry residents, and has mentored several undergraduate and graduate students during clinical and research practical placements.