A student of magic, occultism and religion since the mid-1960s and the editor of the Necronomicon, Simon was a frequent lecturer for the famed Warlock Shop in Brooklyn and the Magickal Childe Bookstore in Manhattan for more than 10 years before his sudden disappearance in 1984, speaking on topics as diverse as religion and politics, occultism and fascism, ceremonial magic, demonolatry, the Tarot, the Qabala, and Asian occult systems.