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John Fangman, MD


Infectious Disease

Undergraduate and Graduate Education

Carleton College – Northfield, MN

Medical School

University of Minnesota – Minneapolis, MN


Massachusetts General Hospital – Boston, MA


Massachusetts General Hospital/Brigham and Women’s Hospital – Boston, MA

Board Certifications

American Board of Internal Medicine, Infectious Disease


John Fangman is a practicing infectious disease doctor and Chief Medical Officer at Mass General Brigham Community Physicians. He graduated from Carleton College with a degree in political science before completing medical school at the University of Minnesota.  He moved to Boston to pursue training in internal medicine and pediatrics at Massachusetts General, Brigham and Women’s, and Boston Children’s hospitals. Following his residency, he was a practicing med-peds physician and assistant residency program director of the Harvard Combined Internal Medicine and Pediatrics Program.  After 5 years as a primary care provider, he pursued adult infectious disease training at MGH and BWH with a focus on the care of people living with HIV.  He returned to the Midwest in 2005 to lead HIV programs at the Medical College of Wisconsin.  While there he held a variety of additional roles including medical director for a large urban HIV program, division chief for infectious diseases, and senior medical director for ambulatory services.  Since returning to Boston in 2020 his work has focused on pandemic response and Mass General Brigham’s efforts to promote value, equity, and care transformation.  His heart remains with the care of patients with HIV infection; he also has a strong interest in tick borne infections and ambulatory infectious diseases.