Moore's first job after leaving school at the age of 16 was as a flour grader at teh Rank Hovie McDougall laboratory in Deptford. A following job as an office boy at Odhams Press (a subsidiary of IPC) led to his becoming a junior sub-editor on Pow! and Fantastic comics three months later. The two comics reprinted strips from Marvel Comics, for whom he would later work.
Moore became a freelance writer in 1972.
Steve was a close friend and acted as a mentor to Alan Moore (famously of no relation). Alan provided the introduction for a collection of Steve's Tales of Telguuth, the first involvement he has had with a 2000AD publication for almost thirty years. Alan described Steve as his "oldest and dearest friend".
Never married, Moore cared for his brother Chris, who suffered from Motor Neurone Disease before Chris's death in 2009.
- Pow! (sub-editor)
- Fantastic (sub-editor)
- The News (contributor)
- Dick Turpin annual
- Supergran annual
- Sherlock Holmes and Dr Watson annual
- Unearthing (essay, 2006)
- V for Vendetta (film novelisation, 2006)
- Somnium (gothic fantasy novel, 2011)
- Fortean Times
- Fortean Studies
- The Fortean Times Book of Strange Deaths (editor)
- The Fortean Times Book of Close Shaves and Amazing Luck