Terence McKenna was an American ethnobotanist, philosopher, and advocate for the responsible use of psychedelic substances. Born in 1946, he became well-known for his ideas about the potential of psychedelics to expand consciousness and promote personal and societal transformation. McKenna often discussed the importance of shamanism and ancient cultures in understanding the human experience. He authored several books, including Food of the Gods and The Archaic Revival, where he explored the relationship between humans and plants, particularly those with psychoactive properties. McKenna's lectures and writings have influenced many in the fields of psychology, spirituality, and alternative culture.