John Romero is an American video game designer and programmer, best known for co-creating the iconic first-person shooter game Doom in 1993. He played a significant role in the development of the id Software company, which revolutionized the gaming industry with its innovative technology and design. In addition to Doom, Romero worked on other influential games like Quake and Wolfenstein 3D. He has been involved in various game development projects throughout his career, contributing to the evolution of video games and inspiring many developers in the industry.