20+ Years of d20 (Patreon)

I have written for a LOT of different d20 System RPGs over my 22 year involvement with the system. I am defining "different" in this case as only including full RPGs that went on to receive at least one supplement, and ignoring both related-but-not-based-on-the-d20-system things like D&D 2nd ed, and generic d20 supplements not official tied to a specific rpg book.

That gives me 15 different d20 Systems I have worked on: Black Company RPG, D20 Modern, D&D 3rd ed, D&D 3.5 ed, EverQuest RPG, EverQuest II, Gamma World RPG, Pathfinder RPG 1st ed, Pathfinder RPG 2nd ed, Star Wars RPG, Star Wars Saga Edition, Star Wars RCR, Starfinder, Thieves' World RPG, and Wheel of Time RPG.

I worked on the core rulebook for more than half of those, and was one of the playtesters for 3.0 D&D. 

My list of non-d20 RPG credits is much shorter. I did some generic magazine articles (mostly about names and languages), a fair bit of 3pp 5e work, some 2nd ed D&D material, some original Alternity RPG articles, a tiny bit of Dragon AGE, a little Song of Ice and Fire RPG... and that might be it. Add some work on Star Wars Miniatures articles and flavor text for various card games, a drop of short fiction, and a lot of advice and insider articles at my blog, and that may the my whole career. (I obviously may have missed a few things... I DO have a running list... somewhere... that I haven't updated recently...)

I am well aware of the built-in assumptions common to a lot of based-on-a-d20 game systems, and am regularly examining them and examining my work for them. Which is not to say they are necessarily bad game tropes--I just want to lean on them (when I do) mindfully, rather than because I haven't studied or considered any alternatives.