[4] In July 1969 he published the first issue of Albion magazine,[5] one of the first European zines, supporting correspondence play of the board game Diplomacy.
His first contribution to White Dwarf was the "Monstermark" system, a way of assessing the relative strength of monsters that might be encountered in a role-playing world.
[8]: 12 Games Workshop negotiated a deal with TSR in 1979 to put this book together by compiling content from the "Fiend Factory" and other British publications.
[8]: 45 It was published in 1981 by TSR UK Ltd. Like its companion volume the Monster Manual, the Fiend Folio provided a listing of creatures that player characters could encounter as part of the first edition of the Advanced Dungeons & Dragons game system.
[8]: 13 In his role as managing director of TSR UK Ltd. he oversaw the publication of a range of titles, including his own "Underwater" modules in conjunction with Dave J. Browne: The Sinister Secret of Saltmarsh, Danger at Dunwater, and The Final Enemy.
[8]: 237 He spent a number of years in the US working for Gary Gygax, and then subsequently as a freelance journalist[15] and occasional restaurant chef.
He also continued to play role-playing games until shortly before his death, running a Dungeons & Dragons campaign in the world of "Urnst" with his friends.