Born in Ilford]], Essex, Grant developed an interest in occultism and Asian religion during his teenage years. After several months serving in India with the British Army amid the Second World War, he returned to Britain and became the personal secretary of Aleister Crowley, the ceremonial magician who had founded Thelema in 1904. Crowley instructed Grant in his esotericpractices, initiating him into his own occult order, the Ordo Templi Orientis (O.T.O.). When Crowley died in 1947, Grant was seen as his heir apparent in Britain, and was appointed as such by the American head of the O.T.O., Karl Germer. Founding the London based New Isis Lodge in 1954, Grant added to many of Crowley's Thelemite teachings, bringing in extraterrestrial themes and influences from the work of H.P. Lovecraft. T