Timothy Leary (1920–1996) was a Harvard professor and psychologist who became an advocate for the use of LSD and other hallucinogenic drugs. Leary was dismissed from Harvard in 1963 over protests of his controversial experiments with psychedelic drugs. He continued to use and to promote the benefits of drugs, gaining an increasingly public profile as he associated with prominent celebrities, artists, and writers, including Allen Ginsberg and William Burroughs. Leary became a popular figure of the counterculture. He was subjected to the criticism of former colleagues and politicians, and he eventually served time in prison for his activities.

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