Jonathan Tweet is an American game designer, known primarily for his work in the field of tabletop role-playing games. He is best known as one of the lead designers of the third edition of "Dungeons & Dragons" (often abbreviated as D&D), the seminal fantasy role-playing game. Tweet has been involved in the gaming industry since the late 1980s and has contributed to various other role-playing games and gaming products. His work extends beyond just D&D, as he has also authored several other game and supplement designs, including "Ars Magica" and "Everway," as well as the creature book "Grandmother Fish," which is aimed at teaching children evolutionary concepts. Throughout his career, Tweet has been recognized for his innovative approaches to game design and storytelling.