Answer by Govindarajan Nagarajan:
Wrote Doom, Quake and Wolfenstein 3D
Invented a square root algorithm that shit on machine instructions
Patented Carmack’s Rerverse
Founded Armadillo Aerospace
CTO at Oculus VR
Regularly releases the entire game and game engine as open source.
A true geek. This guy still codes and does programming unlike many of his peers