Aleister Crowley was an English occultist, ceremonial magician, poet, philosopher, political theorist, novelist, mountaineer, and painter. He founded the religion of Thelema, identifying himself as the prophet entrusted with guiding humanity into the Æon of Horus in the early 20th century. A prolific writer, he published widely over the course of his life.
Crowley gained widespread notoriety during his lifetime, being a drug user, bisexual and an individualist social critic. Crowley has remained a highly influential figure over Western esotericism and the counterculture of the 1960s and continues to be considered a prophet in Thelema. He is the subject of various biographies and academic studies.