Vampire: The Masquerade (1991) and Over the Edge (1992) followed, which were written by Ars Magica designers Mark Rein-Hagen and Jonathan Tweet respectively, the pair having been impressed by the potential of the dice pool mechanic and each having decided to make their own game based on dice pools.
The GNS theory incorporates Jonathan Tweet's three forms of task resolution that determine the outcome of an event.
Jonathan Tweet is a game designer who has been involved in the development of the role-playing games Ars Magica, Everway, Over the Edge, Talislanta and the third edition of Dungeons & Dragons, as well as the Collectible Miniatures Game Dreamblade.
Cook, Jonathan Tweet, and Skip Williams all contributed to the 3rd edition Players Handbook, Dungeon Master's Guide, and Monster Manual, and then each designer wrote one of the books based on those contributions.
Heinsoo was the lead designer on 4th Edition Dungeons & Dragons (2008), and is co-designer of the 13th Age roleplaying game along with Jonathan Tweet.
Monte Cook, Jonathan Tweet, and Skip Williams all contributed to the 3rd edition Players Handbook, Dungeon Master's Guide, and Monster Manual, and then each designer wrote one of the books based on those contributions.
Jonathan Swift | Jonathan Ross | Goodluck Jonathan | Jonathan Demme | Jonathan Lethem | Jonathan | Jonathan Richman | Jonathan Coulton | Jonathan Safran Foer | Jonathan King | Jonathan Rhys Meyers | Jonathan Zittrain | Jonathan Silverman | Jonathan Nott | Jonathan Kaplan | Jonathan Harris | Jonathan Cain | Jonathan Butler | Jonathan Borofsky | Jonathan Aitken | Jonathan Wells | Jonathan Tweet | Jonathan Pryce | Jonathan Pearce | Jonathan Dimbleby | Jonathan Blow | Jonathan Wells (intelligent design advocate) | Jonathan Pollard | Jonathan Harr | Jonathan Cape |
The three primary designers behind the d20 System were Jonathan Tweet, Monte Cook and Skip Williams; many others contributed, most notably Richard Baker and Wizards of the Coast then-president Peter Adkison.