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John D. Carmack II is an American computer programmer, video game developer and engineer. He co-founded id Software and was the lead programmer of its video games Commander Keen, Wolfenstein 3D, Doom, Quake, Rage and their sequels. Carmack made innovations in 3D graphics, such as his Carmack's Reverse algorithm for shadow volumes. In August 2013, he took the position of CTO at Oculus VR.