His best known work is fiction written under the pseudonym Sandy Mitchell—Warhammer and Warhammer 40,000 novels, including the Ciaphas Cain series.
A full-time writer since the mid-1980s, the majority of his work (as Sandy Mitchell) has been tie-in fiction for Games Workshop's Warhammer fantasy and Warhammer 40,000 science fiction lines, as well as a novelisation of episodes from the high tech thriller series Bugs, for which he also worked as a scriptwriter under his real name.
He lives in the North Essex village of Earls Colne, with his wife and daughter.
In the Warhammer Universe, as ISFDB catalogues it, Sandy Mitchell is the sole author of Ciaphas Cain and Dark Heresy series (both listed completely here).
An anthology reprinting Ciaphas Cain short stories is due to be released in early 2025.