John Romero is widely considered as one of the fathers of the modern first person shooter. He is popularly known as the co-creator of Commander Keen, Wolfenstein 3-D, Doom and Quake, along with other titles such as Daikatana.
From the Arcades to the Computer
On Softdisk and Early id Software
On How Mario made Commander Keen
On Wolfenstein 3-D
On Doom, Quake and Leaving id