Jonathan Tweet is an American game designer from Rock Island, Illinois who has been involved in the development of the role-playing games Ars Magica, Everway, Over the Edge, Talislanta, the third edition of Dungeons & Dragons and 13th Age, as well as the Collectible Miniatures Game Dreamblade. In 2015 Tweet released Grandmother Fish a full-color, full-sized book about Evolution aimed at pre-schoolers.