Aleister Crowley (1875–1947), born Edward Alexander Crowley in Royal Leamington Spa, England, was a prominent and controversial figure in the early 20th-century esoteric scene. Dubbed by the press as 'The Wickedest Man in the World,' Crowley was an occultist, ceremonial magician, poet, painter, novelist, and mountaineer. He is perhaps best known for his role as a prophet in Thelema, a spiritual philosophy he claimed to have received from a preternatural entity named Aiwass. This encounter led to his penning of 'The Book of the Law' (1904), which became the cornerstone text of Thelemic beliefs, coining the central tenant 'Do what thou wilt shall be the whole of the Law.' Crowley's literary style is recognized for its rich and symbolic language, often synthesizing mysticism, philosophy, and personal experience. Despite a polarizing reputation—oscillating between a pioneer of spiritual liberation and an accused charlatan—Crowley's influence has been significant in the counterculture and occult movements, and he continues to be a subject of interest in religious and literary scholarship. His works extend beyond 'The Book of the Law' to include other titles such as 'Magick in Theory and Practice' (1929) and 'The Confessions of Aleister Crowley' (1929), an autobiography. Through his prolific writings and complex legacy, Crowley remains a fixture in the study of Western mysticism and the occult.