Timothy Leary
Dismissed from Harvard in 1963, he went on to found his own religious movement around psychedelics and delivered the phrase that defined the era's counterculture at a major San Francisco gathering in January 1967.
The Harvard Psilocybin Project (from 1960); Leary's 'turn on, tune in, drop out' address, the Human Be-In (14 January 1967)
American psychologist who ran Harvard's early psilocybin research programme before becoming the most prominent public advocate of psychedelic drug use.