| Roleplaying Game Credits: |
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| Book | | Publisher | | Credit |
| Monte Cook Presents: The Year's Best d20, Volume One (d20 System (generic)) (2005) | | Malhavoc Press | | Contributing Author |
| Ars Magica, Fifth Ed. (2004) | | Atlas Games | | Creator |
| Broken Covenant of Calebais, The (Ars Magica) (2004) | | Atlas Games | | Author |
| Men of the Sea: Sailor Heroes of Glorantha (HeroQuest) (2004) | | Issaries, Inc. | | Original Material |
| Unearthed Arcana (Dungeons & Dragons) (2004) | | Wizards of the Coast | | Additional Design |
| Dungeons & Dragons Dungeon Master's Guide v.3.5 (2003) | | Wizards of the Coast | | Other Contributions |
| Dungeons & Dragons Dungeon Master's Guide v.3.5 (2003) | | Wizards of the Coast | | Design Team |
| Dungeons & Dragons Miniatures Handbook (2003) | | Wizards of the Coast | | Design |
| Dungeons & Dragons Monster Manual v.3.5 (2003) | | Wizards of the Coast | | Contributor |
| Dungeons & Dragons Monster Manual v.3.5 (2003) | | Wizards of the Coast | | Design Team |
| Dungeons & Dragons Player's Handbook v.3.5 (2003) | | Wizards of the Coast | | Other Contributions |
| Dungeons & Dragons Player's Handbook v.3.5 (2003) | | Wizards of the Coast | | Design Team |
| Dungeons & Dragons Player's Handbook v.3.5 (2003) | | Wizards of the Coast | | Design |
| Pocket Magica (d20 System (generic)) (2003) | | Green Ronin Publishing | | Design |
| Kingdoms of Kalamar Player's Guide (2002) | | Kenzer and Company | | Additional Contributions |
| Pocket Grimoire Arcane (d20 System (generic)) (2002) | | Green Ronin Publishing | | Design |
| Pocket Grimoire Divine (d20 System (generic)) (2002) | | Green Ronin Publishing | | Design |
| Unknown Armies, 2nd Ed. (2002) | | Atlas Games | | Design Consultation and Inspiration |
| Psionics Handbook (Dungeons & Dragons) (2001) | | Wizards of the Coast | | Advice, Admonitions, and Great Ideas |
| Sword and Fist (Dungeons & Dragons) (2001) | | Wizards of the Coast | | Additional Design and Development |
| Dungeons & Dragons Adventure Game (2000) | | Wizards of the Coast | | Design |
| Dungeons & Dragons Dungeon Master's Guide (2000) | | Wizards of the Coast | | Design |
| Dungeons & Dragons Monster Manual (2000) | | Wizards of the Coast | | Design |
| Dungeons & Dragons Player's Handbook (2000) | | Wizards of the Coast | | Design |
| Star Wars Roleplaying Game (2000) | | Wizards of the Coast | | System Design |
| Festival of the Damned, Anniversary Ed. (Ars Magica) (1998) | | Atlas Games | | Author |
| Mage: The Sorcerers Crusade (1998) | | White Wolf | | Additional Concepts |
| Over the Edge, 2nd Ed. (1997) | | Atlas Games | | Concepts |
| Over the Edge, 2nd Ed. (1997) | | Atlas Games | | Design |
| Ars Magica, Fourth Edition (1996) | | Atlas Games | | Design |
| Spherewalker Sourcebook (Everway) (1996) | | Rubicon Games, Inc. | | Contributing Author |
| Spherewalker Sourcebook (Everway) (1996) | | Rubicon Games, Inc. | | Lead Developer |
| Spherewalker Sourcebook (Everway) (1996) | | Rubicon Games, Inc. | | System Design |
| Everway (1995) | | Wizards of the Coast | | Character Design |
| Everway (1995) | | Wizards of the Coast | | Design |
| Faeries (Ars Magica) (1995) | | Wizards of the Coast | | Product Manager |
| Myth of Self, The (Over the Edge) (1995) | | Atlas Games | | Design |
| Black Spine (Dark Sun) (1994) | | TSR, Inc. | | Design |
| Friend or Foe? (Over the Edge) (1994) | | Atlas Games | | Development and Editing |
| Friend or Foe? (Over the Edge) (1994) | | Atlas Games | | Design |
| Houses of Hermes (Ars Magica) (1994) | | Wizards of the Coast | | Concepts |
| Houses of Hermes (Ars Magica) (1994) | | Wizards of the Coast | | Design |
| Lion of the North: The Loch Leglean Tribunal (Ars Magica) (1994) | | Wizards of the Coast | | Development Director |
| Strangers in Prax (RuneQuest) (1994) | | Avalon Hill | | Author |
| With a Long Spoon (Over the Edge) (1994) | | Atlas Games | | Editing |
| Apocalypse (Role Aids) (1993) | | Mayfair Games Inc. | | Author |
| Creative Campaigning (Advanced Dungeons & Dragons) (1993) | | TSR, Inc. | | Design |
| Over the Edge Players' Survival Guide (1993) | | Atlas Games | | Design |
| Over the Edge Players' Survival Guide (1993) | | Atlas Games | | Interior Artist |
| Over the Edge Players' Survival Guide (1993) | | Atlas Games | | Inspiration |
| Over the Edge Players' Survival Guide (1993) | | Atlas Games | | Additional Material |
| Unauthorized Broadcast (Over the Edge) (1993) | | Atlas Games | | Editing |
| City of Gold (Forgotten Realms) (1992) | | TSR, Inc. | | Design |
| New Faces (Over the Edge) (1992) | | Atlas Games | | Design |
| Over the Edge (1992) | | Atlas Games | | Design |
| Over the Edge (1992) | | Atlas Games | | Concepts |
| Talislanta Guidebook, 3rd Ed. (1992) | | Wizards of the Coast | | Design |
| A Winter's Tale (Ars Magica) (1991) | | White Wolf | | Devil's Advocate |
| Faeries (Ars Magica) (1991) | | White Wolf | | Author |
| Festival of the Damned (Ars Magica) (1991) | | Atlas Games | | Design |
| Ars Magica (1989) | | Lion Rampant | | Layout |
| Ars Magica (1989) | | Lion Rampant | | Cartography and Character Sheets |
| Ars Magica (1989) | | Lion Rampant | | Game Design and Development |
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| Other Game Credits: |
| |
| Product | | Publisher | | Credit |
| Magic: The Gathering, 9th Ed. (2005) | | Wizards of the Coast | | Development Contribution |
| Magic: The Gathering, 9th Ed. (2005) | | Wizards of the Coast | | Core Game |
| Surviving On the Edge (1995) | | Atlas Games | | Contributor |
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| Magazine Article Credits: |
| |
| Article | | Credit |
| "Critical Threats: Hungash" in Dungeon #100 (Jul 2003) | | Author |
| "Dungeon of the Fire Opal" in Dungeon #84 (Jan/Feb 2001) | | Author |
| "Fate of the Grog, The" in White Wolf Magazine #14 (Feb 1989) | | Author |
| "Giving the Devil His Due" in White Wolf Magazine #23 (Oct/Nov 1990) | | Author |
| "Houses of Hermes, The" in White Wolf Magazine #16 (Jun/Jul 1989) | | Author |
| "How to Design a Feat" in Dragon #275 (Sep 2000) | | Author |
| "Mastering Chance" in Dragon #280 (Feb 2001) | | Author |
| "Omega World" in Polyhedron #153 (Sep 2002) | | Game Design |
| "One Roll to Rule Them All" in Dragon #274 (Aug 2000) | | Author |
| "Order of Hermes: The Enigmatic Society of Wizards" in White Wolf Magazine #11 | | Author |
| "Powerful Characters and Their Families or My Son, the Adventurer" in White Wolf Magazine #47 | | Author |
| "Scope of Magic, The" in White Wolf Magazine #13 (Dec 1988) | | Author |
| "Skill Mastery" in White Wolf Magazine #15 (Apr/May 1989) | | Author |
| "Sneak Preview: D&D Miniatures" in Dragon #311 (Sep 2003) | | Author |
| "Wedding Bells" in Dungeon #89 (Nov/Dec 2001) | | Author |
| "Wizard Archetypes" in White Wolf Magazine #19 (Feb/Mar 1990) | | Author |
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| Short Story Credits: |
| |
| Story | | Credit |
| "Deathbringer, The" (Magic: The Gathering) in Myths of Magic, The | | Author |
| "Heroes of Alpha Complex, The" (Paranoia) in Shadis #30 | | Author |
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