Doom (1993 video game)
The ability for others to create custom levels and otherwise modify the game using WAD files turned out to be a popular aspect of "Doom". Gaining the first large mod-making community, "Doom" affected the culture surrounding first-person shooters, and also the industry. Several future professional game designers started their careers making "Doom" WADs as a hobby, among them Tim Willits, who later became the lead designer at id Software.
Shawn Green (game designer)
Shawn C. Green is a video game developer who is best known for his work in the "Doom" and "" series for id Software and for 3D Realms. He also worked on "Daikatana" as a programmer for Ion Storm in Dallas, Texas, United States. He has also worked for Gearbox Software making "", as well as co-founding Escalation Studios before becoming a Tibetan Buddhist yogi whose whereabouts are currently known to only a select few.