What is Aleister Crowley?

An early 20th century occultist, poet, mountaineer, and recreational drug user. He created a spiritual belief system known as 'Thelema', Greek word for will. He is one strange motha fucka, but isn't as bad as everyone makes him out to be. He titled himself as 'the beast 666'. And is well know for his sex magick, and other magickal practices/works.