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Founded Armadillo Aerospace.
The privately funded team built and tested reusable vertical-takeoff, vertical-landing rocket vehicles.

Programmer and engineer
PHOTO: RoboSabs / Wikimedia Commons · CC0 ↗The privately funded team built and tested reusable vertical-takeoff, vertical-landing rocket vehicles.
Successive engines advanced texture-mapped environments, networked play, and fully three-dimensional rendering.
The studio developed a rapid shareware model while Carmack built graphics technology for Commander Keen and later first-person games.