Alfonso John Romero is a game designer, programmer, and developer in the video game industry. He is best known as a co-founder of id Software and was the lead designer for many of their personal computer games including Wolfenstein 3D, Doom, and Quake. His game designs and development tools, along with new programming techniques created and implemented by id Software's lead programmer John Carmack, led to a mass-popularization of the first person shooter, or FPS, in the 1990s. He is also credited with coining the FPS multiplayer term "deathmatch."