Peter Grinspoon, M.D. is a primary care physician and cannabis specialist at Massachusetts General Hospital and an Instructor in Medicine at Harvard Medical School. He is the author of the book "Aging Well with Cannabis. Feel Better, Sleep Better, and Live Better with Marijuana and CBD" He is a TedX speaker, a national media figure and the author of the groundbreaking memoir ‘Free Refills: A Doctor Confronts His Addiction’. He is a board member of the physician advocacy group, ‘Doctors for Cannabis Regulation’.