• Forged with Fire—Top Secret: New World Order RPG adventure. Berkeley: TSR Games, 2023.
• Smugglers’ Guide to the Rim—Firefly RPG supplement. Madison: Margaret Weis Productions, 2015.
• Kobold Guide to Combat. Kirkland, WA: Kobold Press, 2014.
• Kobold Guide to Magic. Kirkland, WA: Kobold Press, 2014.
• Hillfolk: Blood on the Snow. London: Pelgrane Press, 2013.
• Sunward—Eclipse Phase supplement. Lake Stevens, WA: Catalyst Game Labs, 2010. Nominee, 2011 Origins Award, Best RPG Supplement.
• Guide to the Hunted: Supernatural supplement. Madison: Margaret Weis Productions, 2010.
• Savage Suzerain—Suzerain supplement. New York: Talisman Studios, 2010.
• Warhammer Fantasy Roleplay. Roseville, MN: Fantasy Flight Games, 2009.
• The Supernatural Role Playing Game. Madison: Margaret Weis Productions, 2009.
• Mars: Savage Worlds Edition. Lawrence, KS: Adamant Entertainment, 2009.
• The Career Compendium—Warhammer FRPG supplement. Roseville, MN: Fantasy Flight Games, 2009.
• The Free Musketeers—Suzerain supplement. New York: Talisman Studios, 2008.
• Lure of the Lich Lord – Warhammer FPRG supplement. Seattle: Green Ronin, 2007. 2007 Gold ENnie, Best Adventure
• Shaintar. Atlanta: Talisman Studios, 2007.
• Alliance Players Guide—Warcraft game supplement. Atlanta: Sword and Sorcery Studio, 2006.
• Lands of Mystery—Warcraft game supplement. Atlanta: Sword and Sorcery Studio, 2006.
• Legends of the Twins—Dragonlance game supplement. Madison, WI: Sovereign Press, 2005.
• Shadowspawn’s Guide to Sanctuary—Thieves’ World supplement. Seattle: Green Ronin, 2005.
• Deryni Roleplaying Game. Boston: Grey Ghost Press, 2005. Nominee, 2006 Origins Award, Best RPG.
• Helm’s Deep—Lord of the Rings supplement. Los Angeles: Decipher, 2005.
• The Blue Rose Companion—Blue Rose game supplement. Seattle: Green Ronin, 2005.
• Isengard—Lord of the Rings game supplement. Los Angeles: Decipher, 2004.
• Fields of Battle: The Guide to Barbarians & Warriors—Lord of the Rings game supplement. Los Angeles: Decipher, 2004.
• Stargate SG-1: Season Three—Stargate SG-1 game supplement. Ontario: Alderac Entertainment Group, 2004.
• Realms of Norrath: Dagnor’s Cauldon—EverQuest game supplement. Atlanta: Sword and Sorcery Studio, 2004.
• World’s Largest Dungeon. Ontario: Alderac Entertainment Group, 2004.
• Realms of Norrath: Greater Faydark—EverQuest game supplement. Atlanta: Sword and Sorcery Studio, 2004.
• Mythic Vistas: Trojan War. Seattle: Green Ronin, 2004.
• Relics and Rituals: Excalibur. Atlanta: Sword and Sorcery Studio, 2004.
• Advanced d20 Compendium. Atlanta: Sword and Sorcery Studio, 2004.
• Races of Destiny—Dungeons & Dragons supplement. Seattle: Wizards of the Coast, 2004.
• Relics and Rituals: Olympus. Atlanta: Sword and Sorcery Studio, 2004.
• Mythic Vistas: Trojan War. Seattle: Green Ronin, 2004.
• Relics and Rituals: Excalibur. Atlanta: Sword and Sorcery Studio, 2004.
• Vampire Players’ Guide—Vampire game supplement. Atlanta: White Wolf, 2003.
• Creatures—Star Trek game supplement. Los Angeles: Decipher, 2003.
• Fell Beasts and Wondrous Magic—The Lord of the Rings game supplement. Los Angeles: Decipher, 2003.
• The Eastern Seaboard—Asylum game supplement. New York: Clockworks, 2003.
• The Shields of Justice: A Hero’s Almanac—Silver Age Sentinels supplement. Montreal: Guardians of Order, 2003.
• Dark Inheritance. Seattle: Mythic Dreams, 2003.
• Realms of Norrath: Everfrost Peaks—EverQuest supplement. Atlanta: Sword and Sorcery Studio, 2003.
• Everquest Gamemasters Guide. Atlanta: Sword and Sorcery Studio, 2003.
• Beasts of the Wyld—Exalted supplement. Atlanta: White Wolf, 2003.
• Roll Call—Silver Age Sentinels supplement. Montreal: Guardians of Order, 2003.
• Horrors of the Wasted West—Hëll on Earth d20 supplement. Richmond: Pinnacle Entertainment Group, 2002.
• Cthulhu GM Pack—accessory for Pulp Cthulhu RPG. San Francisco: Chaosium, 2002.
• The Great Weird North—Deadlands supplement. Richmond: Pinnacle Entertainment Group, 2002.
• Gamemastering Secrets. Boston: Grey Ghost Press, 2002. 2003 Origins Award for Best Game Aid.
• Dead From Above- Weird Wars supplement. Richmond: Pinnacle Entertainment Group, 2002.
• The JSA Sourcebook—DCU RPG supplement. Boston: West End Games, 2001.
• Chosen. New York: Clockworks, 2001.
• Sins of the Blood—Vampire game supplement. Atlanta: White Wolf, 2001
• Dying Earth RPG. London: Pelgrane Press, 2001.
• The Gotham Sourcebook—DCU game supplement. New York: West End Games. October 2000.
• Asylum Quick-Start—Asylum game supplement. New York: Clockworks, 2000.
• The JLA Sourcebook—DCU game supplement. New York: West End Games. August 2000.
• Outside Standard Channels—Spookshow game supplement. New York: Clockworks, 2000.
• Nights of Prophecy—Vampire game supplement. Atlanta: White Wolf, 2000.
• The Staff Manual—Asylum game supplement. New York: Clockworks, 1999.
• “Dead Connections”—Conspiracy X demo advenure. Albany: Eden Studios, 1999.
• “Long Live . . . Everyone?” —Conspiracy X demo advenure. Albany: Eden Studios, 1999.
• The Price of Freedom—Star Trek game supplement. Los Angeles: Last Unicorn, 1999.
• Tales of Magick: Dark Adventure—Mage game supplement. Atlanta: White Wolf, 1999.
• Spookshow. New York: Clockworks, 1998.
• Asylum. New York: Clockworks, 1997.
• Film Festival #1—Hong Kong Action Theatre game supplement. Kansas City: Event Horizons Publications. April 1997.
• The Strange Files of Dr. Sorcis—Don’t Look Back game supplement. Boston: Mind Ventures Games, 1996.
• Hong Kong Action Theatre. Kansas City: Event Horizons Publications, 1996.
• Age of Empire. Kansas City: Epitaph Studios, 1996.
• Periphery. Kansas City: Epitaph Studios, 1994.