Moore wrote Axel Pressbutton, Zirk and Father Shandor for Warrior (under the alias Pedro Henry). For 2000 AD, meanwhile, he scripted Tharg's Future Shocks (a format he created), Dan Dare, Red Fang, Valkyries, Rick Random, Judge Dredd, Agent Rat, Past Imperfect and Tales of Telguuth. He also contributed to A1, amongst other titles.
Steve was a longtime friend of (and mentor to) Alan Moore (no relation), who described him as his "oldest and dearest friend." He wrote Young Tom Strong and Jonni Future for Alan's America's Best Comics line, and the novelisation of V for Vendetta. Much of his 2000 AD and Warrior work was reprinted for the US market by Eagle Comics/Quality Comics and Eclipse Comics, and he scripted the Marvel Comics adaptation of the James Bond movie Octopussy. Later work included Hercules for America's Radical Comics. At the time of his death, aged 64, Steve was collaborating with Alan Moore on The Moon and Serpent Bumper Book of Magic. He had spent many years caring for his brother, who had motor neurone disease.