Timothy Leary: Timothy Leary, an American psychologist and writer, is known for his advocacy of psychedelic drugs and his involvement in the counterculture movement of the 1960s. Born in 1920, Leary conducted controversial experiments with psychedelic substances, exploring their potential for expanding consciousness and promoting personal growth. He popularized the phrase Turn on, tune in, drop out, advocating for the exploration of altered states of consciousness as a means of self-discovery and spiritual awakening. Leary's provocative ideas and his challenge to conventional norms continue to influence discussions on drug policy, consciousness, and human potential.