"game developer"... He created a couple of small time indie titles : DOOM, Quake, with a hobby company called ID software
At least, I think that's how the history went. I could be wrong.
People tend to seem to start from #1
But seriously, is there a better title to give him for that part of his work?
Edit: Pioneering achievements, yes, certainly, but pioneer as in "game development pioneer"…
Omnissiah or Machine Spirit.