Alfonso John Romero (born October 28, 1967) is an American director, designer, programmer, and developer in the video game industry. He is best known as a co-founder of id Software and designer for many of their games, including Wolfenstein 3D, Dangerous Dave, Hexen, Doom, Doom II and Quake. His game designs and development tools, along with new programming techniques created and implemented by id Software's lead programmer John D. Carmack, led to a mass popularization of the first-person shooter, or FPS, in the 1990s. He is credited with coining the FPS multiplayer term "deathmatch".
Romero was born in Colorado Springs, Colorado in the United States. He is of Mexican, Yaqui and Cherokee heritage. His mother Ginny met Alfonso Antonio Romero when they were teenagers in Tucson, Arizona. Alfonso, a first-generation Mexican American, was a maintenance man at an air force base, spending his days fixing air conditioners and heating systems. After Alfonso and Ginny got married, they headed in a 1948 Chrysler with three hundred dollars to Colorado, hoping their interracial relationship would thrive in more tolerant surroundings.