Harvard psychologist who revolutionized our understanding of consciousness through his groundbreaking research with psychedelics in the 1960s. His studies at Harvard with psilocybin showed remarkable potential for treating mental health conditions, addiction, and prisoner rehabilitation. Known for his controversial motto "turn on, tune in, drop out," Leary became a counterculture icon who advocated for consciousness expansion and personal transformation through psychedelic experiences. His work at the Millbrook estate became legendary, where he developed methods for creating optimal settings for transformative experiences. Despite facing significant legal challenges and imprisonment, Leary continued to promote the responsible use of psychedelics for personal growth and spiritual development throughout his life. His influence extended beyond psychedelics to early computer technology and death rights advocacy, making him a truly multifaceted pioneer of human consciousness.