To a generation in full revolt against any form of authority, «Tune in, turn on, drop out» became a mantra, and its popularizer, Timothy Leary, a guru. A charismatic and brilliant psychologist, Leary became first intrigued and then obsessed by the effects of psychedelic drugs in the 1960s while teaching at Harvard, where he not only encouraged but instituted their experimental use among students and faculty. Journalist and editor Robert Greenfield (also the biographer of Jerry Garcia and rock promoter Bill Graham) presents this first major biography of Leary, immersing the reader in the life and times of this intriguing but troubled counterculture icon.