Phil Masters' writing credits in role-playing games go back to White Dwarf Magazine #20 and the Fiend Folio of Advanced Dungeons & Dragons. He described his British campaign for the Champions superhero game in Kingdom of Champions (1990) from Hero Games.:150:42 He contributed adventures to Hogshead Publishing's licensed version of Warhammer Fantasy Roleplay in the mid 1990s.:305 Masters also contributed articles to the magazineThe Excellent Prismatic Spray,:384 and for Cugel's Compendium of Indispensable Advantages for The Dying Earth Roleplaying Game, by Pelgrane Press. He also co-wrote or contributed to two supplements for Ars Magica later in the decade. 
Masters has written or co-written numerous GURPS supplements, including GURPS Arabian Nights, GURPS Castle Falkenstein and GURPS Discworld, and various Mage: The Sorcerer's Crusade supplements for White Wolf, Inc. He also created The Skool Rules, a game based on the Nigel Molesworth books, and has self-published The Small Folk, a wainscott fantasy RPG based on his contribution to Dreaming Cities for Guardians of Order.
- Shannon Appelcline (2011). Designers & Dragons. Mongoose Publishing. ISBN 978-1-907702-58-7.
- Schick, Lawrence (1991). Heroic Worlds: A History and Guide to Role-Playing Games. Prometheus Books. ISBN 0-87975-653-5.
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