Greg Costikyan

Greg Costikyan, sometimes known under the pseudonym Designer X, is an American game designer and science fiction writer. Costikyan's career spans nearly all extant genres of gaming, including: hex-based wargames, role-playing games, boardgames, card games, computer games, online games, and mobile games. Several of his games have won Origins Awards. He co-founded Manifesto Games, now out of business, with Johnny Wilson in 2005.