Charles Stansfield Jones, also known as Frater Achad, was at one time designated to be Aleister Crowley's magical heir when Achad's magical advancement coincided with Crowley's search for a successor. A student of Crowley's Thelemic mystery schools, Jones discovered the "key" to The Book of the Law, sourcework of Thelemic magick. His magical attainment remains both an inspiration and warning as some saw him as an Adept, beyond their understanding, while others thought him mad, or stuck in the Abyss. He is the author of many other books and articles.

Lon Milo DuQuette is a prominent world-renowned occultist and author of several books, including Understanding Alesiter Crowley's Thoth Tarot, My Life with the Spirits, and The Magick of Aleister Crowley.