Dr. Matthew Sullivan is a licensed staff psychologist in the Behavioral Medicine Service in the Psychiatry Department at Massachusetts General Hospital. His clinical specialties include the use of cognitive behavioral therapy (CBT) to address anxiety, depression, and stress in the context of medical illness. His work also focuses on reducing harms related to substance use. Dr. Sullivan has specialized training in interventions to promote health behavior change, including delivering cognitive behavioral therapy for insomnia (CBT-I) and helping patients to quit smoking, increase physical activity, and change unhealthy eating. He has substantial clinical experience serving LGBTQ+ patients. Dr. Sullivan is Member of the Faculty at Harvard Medical School and is an affiliated researcher at Fenway Community Health, Boston.

Dr. Sullivan completed his undergraduate degree in Psychology and English at Williams College. He obtained his PhD in clinical psychology at the University of Connecticut, with specialization in Health Psychology and Quantitative Research Methods. As a predoctoral student, Dr. Sullivan trained for four years as a T32 Fellow in the Social Processes of HIV/AIDS. He completed his pre-doctoral and post-doctoral fellowships at Harvard Medical School/Massachusetts General Hospital.