After graduating with a BA in Physics from Cornell University, Dr. Sewell decided to pursue his interest in entheogens by obtaining an MD from the University of Connecticut School of Medicine in 1998 then completing a combined residency in Neurology and Psychiatry at the University of Massachusetts School of Medicine in 2004, where he served as Chief Resident in Neuropsychiatry. Following this, he attended a substance abuse research fellowship at McLean Hospital/Harvard Medical School, where he served as Managing Editor of the McLean Annals of Behavioral Neurology. He also published the first paper ever on the response of cluster headache to psilocybin and LSD, presenting the data both at the American Psychiatric Association Annual Meeting and the International LSD Symposium in Basel in 2006.