Septimus Genevieve Cogman - contributions to In Nomine, Exalted; co-authored Orpheus Andy Collins - Dungeons & Dragons 4th edition William W. Connors - contributions to Dungeons & Dragons David "Zeb" Cook - Dwellers of the Forbidden City, Slave Pits of the Undercity, Amazing Engine system, Advanced Dungeons & Dragons 2nd edition Monte Cook - Ptolus, Numenera; co-creator of Dungeons & Dragons 3rd edition, Sue Weinlein Cook - SAGA System Bruce Cordell - many Dungeons & Dragons supplements, notably Return to the Tomb of Horrors and the Expanded Psionics Handbook Steven Cordovano - The Compleat Alchemist Peter Corless - founder of Green Knight Publishing; contributions to Pendragon Greg Costikyan - creator of Star Wars: The Roleplaying Game and Violence; co-creator of Toon and Paranoia Jeremy Crawford - co-designer of Blue Rose; lead game designer for Dungeons & Dragons 4th edition Croc - In Nomine Satanis/Magna Veritas, Stella Inquisitorus N. Robin Crossby - Hârn, HarnMaster John H. Crowe III - contributions to Call of Cthulhu Paul Czege - My Life with Master D Tom Dalgliesh - founder of Columbia Games; co-author of the Pilots' Almanac for HârnMaster Ryan Dancey - co-author of the Hero Builder's Guidebook; conceived and developed the Open Game License concept Liz Danforth - Tunnels & Trolls, fifth and subsequent editions Richard Dansky - various World of Darkness settings Peter Darvill-Evans - co-creator of Time Lord; several Fighting Fantasy books Graeme Davis - Warhammer Fantasy Roleplay, Mind's Eye Theatre LARP Jesse Decker - contributions to Dungeons & Dragons 4th edition Tim Dedopulos - contributions to Unknown Armies and Hunter: The Reckoning Jeff Dee - Villains and Vigilantes Marcelo Del Debbio - Arkanun, Trevas, RPGQuest (Brazilian RPGs) Troy Denning - Chill 2nd edition; co-author of Dark Sun James "Grim" Desborough - Gor role-playing game; contributions to Dungeons & Dragons 3.5 edition Dennis Detwiller - co-author of Delta Green, Godlike and Nemesis Joe Dever - Lone Wolf, Greystar, Freeway Warrior Larry DiTillio - Masks of Nyarlathotep Kevin Dockery - The Morrow Project Michael Dobson - contributions to various TSR settings Rob Donoghue - co-author of Leverage: The Roleplaying Game, Marvel Heroic Roleplaying and Spirit of the Century Dale Donovan - contributions to Dungeons & Dragons Tom Dowd - Mind's Eye Theatre LARP, co-author of Shadowrun, contributions to the Storyteller system Ann Dupuis - contributions to GURPS and Fudge* E Darin "Woody" Eblom - co-founded Atlas Games; On the Edge Ron Edwards