Id Software
From wiki.gp2x.org
id Software is a computer game developer based in Mesquite, Texas, a suburb of Dallas. The company was founded by four members of the computer company Softdisk: John Carmack, a programmer, John Romero and Tom Hall, game designers, and Adrian Carmack, an artist and is now considered the most influential of the many game development companies in the Dallas area, known as the Dallas Gaming Mafia.
A detailed history of id Software and descriptions of all their games can be found at Wikipedia.