Aleister Crowley:

Aleister Crowley (1875 - 1947) is certainly the single most influential occult practitioner of the last century, as well as being the most controversial. His literary output is astonishing in both volume and variety, including poetry, drama, and fiction in addition to his core Magical writings. Since his writings have been drawn upon, often without acknowledgement, by nearly every occultist in the English-speaking world it behooves any person interested in Magick or occultism to have some direct acquaintance with Crowley’s work.  25% Off On All Ebooks and Collections