Joshua ran the original Mayfair's DC Heroes RPG mailing list, from which he spearheaded an "Unofficial DC Heroes 4th Edition". The 4th Edition was eventually published by Pulsar Games Inc. as "The Sidekick Sourcebook", a supplement to the first print run of "The Blood of Heroes RPG" (essentially a word-for-word reprint of DC Heroes RPG 3rd Edition).
After "Sidekick Sourcebook", Joshua was brought on as a writer and rules editor to for all future Pulsar Games products: "Adventure Book One", "Blood of Heroes : Special Edition", and "Gamemaster's Screen".
Joshua had a Paranoia RPG adventure (with Call of Cthulhu overtones) "The Call of Computer" published in Steve Jackson Games' Pyramid Magazine #28. Pyramid Online published a few of his articles including "Robo Chess" (w. Ken Cooney) combining "Robo Rally" and chess, "Lovecraftian Supers" (w. Chad Underkoffler) about mixing super-heroes and Call of Cthulhu, and at least one review for Starfarers of Catan.