Cavendish was educated at
Christ's Hospital and at
Brasenose College,
Oxford, where he specialized in
medieval studies.
The Daily Telegraph said that Cavendish was considered "an authority on magic, myth, and witchcraft" and that his work was highly regarded for its depth of research and
agnostic stance towards its sometimes controversial subject matter. Some of his books like
The Black Arts: A Concise History of Witchcraft, Demonology, Astrology, and Other Mystical Practices Throughout the Ages and
The Powers of Evil in Western Religion, Magic and Folk Belief were written for a lay audience rather than for scholars, and had become bestsellers with
The Black Arts passing its 40th edition. In his 2016 obituary,
The Times described him as: "Gregarious author and historian who became Britain's foremost authority on the occult while steadfastly refusing to dabble himself." ==Works==