Doug Church is an American video game designer and producer. He started out at MIT in the late 1980s. Instead of finishing up there, he left and joined Looking Glass Studios, where the team was producing MS-DOS-based immersive sim games like Ultima Underworld, Ultima Underworld II, System Shock and the Thief series. His colleague Warren Spector has pointed out that Church was likely the one who first came up with the term "immersive simulation".