Suzanne Sisley, M.D.is a board-certified psychiatrist who is well known for her in-depth study of cannabis as a treatment for PTSD and is a foremost authority on the emerging science. As a former clinical assistant professor at the University of Arizona College of Medicine, Dr. Sisley obtained approval by the National Institute on Drug Abuse to conduct a clinical study about the efficacy and safety of medical marijuana in treating veterans with PTSD. When political fallout barred her from conducting the controversial cannabis study at the university, she received a $2 million grant from the State of Colorado and resumed her research under the auspices of the non-profit Multidisciplinary Association for Psychedelic Studies. Dr. Sisley’s cannabis study is now in Phase II of the FDA-sanctioned clinical trial with a number of veterans who suffer with PTSD.