is a primary care physician at Massachusetts General Hospital and an Instructor at Harvard Medical School. He is a board member of the advocacy group Doctors For Cannabis Regulation. He spent two years as an Associate Director of the Massachusetts Physician Health Service helping physicians with addiction and mental health issues.


He is the author of the memoir ‘Free Refills: A Doctor Confronts His Addiction’. He graduated with an M.A. in Philosophy with honors from Swarthmore College. He then spent five years as a Campaign Director for the environmental group Greenpeace before entering medical school at Boston University School of Medicine, where he graduated with honors. He completed his residency at Harvard’s Brigham and Woman’s Hospital, in the primary care program.  


He has been on national television including NBC, C-SPAN and Fox and Friends discussing cannabis and the opioid crisis, he has been quoted in the national press such as People magazine and his writing has been published in The Nation and The Los Angeles Times. He is a Contributing Editor to Harvard Health Publications.


Today he is proudly eleven years in recovery from opiate addiction. He lives in Newton, Massachusetts with his wife Liz Grinspoon, his blended family, and his dog, Benji.

Peter's father, Dr. Lester Grinspoon, is widely considered to be the "grandfather of medical marijuana" due to his legendary advocacy on behalf of cannabis legalization, starting with his groundbreaking 1971 book "Marihuana Reconsidered". There is a world famous strain of cannabis named after him, a sativa called Dr. Grinspoon, which is known for its tendency to induce creativity, a calm cerebral mind frame, and conviviality among its users.

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