Grant's occult experiences began in 1939 during World War II, when he claims to have received the first transmission of the "outerhuman being" S'lba. This was followed in 1943 with the reception of The Chronicles of Kralnia.

He met and began personal tutelage in magick under Aleister Crowley in 1944, at the age of twenty. Crowley was sixty-nine.

Apart from Crowley he has been influenced in his occult work by Austin Osman Spare.

Grant met Aleister Crowley in 1944 and was initiated into the A.'.A.'. in 1946. According to occult historian P.R. Koenig, Crowley called Grant "a definite gift from the Gods", but a careful reading of this citation show Crowley was praising Grant's work as a secretary. In March 1946, Crowley wrote in his diary: "Value of Grant: if I die or go to U.S.A., there must be a trained man to take care of the English O.T.O."

After Crowley's death, Grant's was issued a IX° charter in O.T.O by Crowley's successor, Karl Germer, in 1948; and received authorisation to form an O.T.O. Camp in England in 1951. In 1952, he wrote a new manifesto for his group and had 5000 copies printed.

In 1954, Grant began the work of founding the New Isis Lodge. The lodge became operational in April 1955 when Grant issued a manifesto announcing his discovery of a "Sirius/Set current" upon which the lodge was to be based. Karl Germer was so displeased with this manifesto that on July 20, 1955, he issued a "Note of Expulsion" expelling Grant from O.T.O., and naming Noel Fitzgerald as the leader of the British section of the Order

Nevertheless, Grant claimed for himself the title O.H.O. (Outer Head of the Order) of Ordo Templi Orientis. The branch under the leadership of Grant was commonly called the "Typhonian" Ordo Templi Orientis, but is now officially named the Typhonian Order. The New Isis Lodge was absorbed into Grant's Order in 1962.

Members of Grant's Ordo Templi Orientis in the past have considered him the rightful O.H.O. of O.T.O, as evidenced by this quote from a 1976 edition of Sothis magazine:

Karl J. Germer, having proved himself blind to the implication of Crowley's letter to him, failed to understand and accept when — soon after Crowley's death — Grant submitted his plans for change... It remains to remind those who support the old-aeon concept of the O.T.O. that they have not produced — nor can they ever produce — the slightest evidence of a creative current in any of its forms.

Grant was a great admirer and close friend of Austin Osman Spare. Together they founded the Zos Kia Cultus in 1952. Over the years, Grant did much to bring his friend Spare's name into western occult society, including the publication of Images and Oracles of Austin Osman Spare and Zos Speaks!, as well as numerous references and mentions in the Typhonian Trilogies.Grant currently lives in the Bromley common area of South London.

The Typhonian Trilogies

• The Magical Revival ISBN 0-87728-217-X
• Aleister Crowley and the Hidden God ISBN 0-87728-250-1
• Cults of the Shadow
• Nightside of Eden ISBN 1-871438-72-1
• Outside the Circles of Time
• Hecate's Fountain ISBN 1-871438-96-9
• Outer Gateways ISBN 1-871438-12-8
• Beyond the Mauve Zone ISBN 0-9527824-5-6
• The Ninth Arch ISBN 0-9543887-0-4

Other works on the occult

• Remembering Aleister Crowley ISBN 1-871438-12-8
• Hidden Lore: The Carfax Monographs by Kenneth & Steffi Grant
• Images and Oracles of Austin Osman Spare
• Zos Speaks! (about Austin Osman Spare)
• At the feet of the Guru ISBN 0954388763

Poetry

• The Gulls Beak
• Black to Black
• Convolvulus

Novellas and short stories

• The Stellar Lode
• Against the Light ISBN 0952782413
• Snakewand and the Darker Strain ISBN 0952782472
• The Other Child and other tales
• Gamaliel Diary of a Vampire and Dance, Doll, Dance ISBN 0954388720