J.D. Wiker is a designer of roleplaying games, notable for his extensive contributions to the Star Wars Roleplaying Game published by Wizards of the Coast. For a period, he was known as the "Star Wars answer guy" on the company's online forums. Additionally, he authored the initial fifty "Jedi Counseling" columns, providing guidance and addressing inquiries related to the rules and concepts of the Star Wars d20 RPG. His involvement with the game ceased following his layoff from Wizards of the Coast in September of 2002. (Due to legal reasons, he was unable to continue freelancing on the Star Wars Roleplaying Game after his position was eliminated, although he was able to contribute to the Star Wars Miniatures Game Ultimate Missions series.) He later resumed work on the RPG with the Saga Edition.
- Star Wars Roleplaying Game Core Rulebook - November 2000
- Secrets of Naboo - January 2001
- Secrets of Tatooine - March 2001
- The Dark Side Sourcebook - August 2001
- The New Jedi Order Sourcebook - February 2002
- Star Wars Roleplaying Game Revised Core Rulebook - May 2002
- Power of the Jedi Sourcebook - August 2002
- The Clone Wars Sourcebook (with Daniel Wallace ) - 2003 (Cancelled)
- Hero's Guide - June 2003
- Galactic Campaign Guide - September 2003
- Ultimate Missions: Rebel Storm - November 2004
- Ultimate Missions: Clone Strike - February 2005
- Ultimate Missions: Revenge of the Sith - May 2005
- Scum and Villainy - November 2008
- The Clone Wars Campaign Guide - January 2009
- Rebellion Era Campaign Guide - July 2009
- " The Smugglers Alliance " — Star Wars Gamer 3
- " Ships of the Smuggler's Alliance " — Star Wars Gamer 4
- " Kashyyyk in Flames " — Star Wars Gamer 4
- Only the Force - 2004