Didn't he code on Solaris or something weird in the workstation family and port quake over to dos? I only remember him having a giant CRT monitor where he'd sit and code for photos back in the 90s
It was NextSTEP and that was for Doom. I think they switched to Windows NT for Quake (or was that Quake 2?), which is what he was working on in that pic with the giant CRT.