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Timothy Francis Leary was an American author, psychologist, and spiritual teacher. He was a prominent figure in the counterculture of the 1960s and 1970s, and a key figure in the psychedelic movement. Leary advocated the use of psychedelic drugs, such as LSD, psilocybin, and mescaline, to promote spiritual growth and personal transformation. He was also a vocal opponent of the Vietnam War, and was imprisoned for his drug advocacy.