From Timothy Leary's first trip (on psilocybin) in Mexico in 1960, his life;s work became exploring and preaching the benefits - social, aesthetic and spiritual - that psyche-delic drugs had to offer. Leary, with fellow psychologists Metzner and Alpert, began experimenting with LSD on themselves and others at Harvard, and from this came The Psychedelic Experience and, with it, the future of the counterculture.