Timothy Francis Leary (October 22, 1920 – May 31, 1996) was an American psychologist and writer, known for advocating psychedelic drugs, perhaps even to assist psychotherapy. During American legality of LSD and psilocybin, Leary conducted experiments under the Harvard Psilocybin Project, resulting in the Concord Prison Experiment and the Marsh Chapel Experiment. Though obtaining useful data, Leary and his associate Richard Alpert were fired by Harvard University amid controversy surrounding such drugs.

source: wikipedia