This is the great Bobby Prince, our music composer between 1991-1994. He did the music for Commander Keen 4, 5, 6, Catacomb 3D, Wolfenstein 3D, Spear of Destiny, DOOM, DOOM II. In this picture you can see Bobby at id's apartment office during the summer of 1992, working on the music for Wolf3D and Spear of Destiny. This picture is probably from the month of June. The computer he's using in the pic is a 386/33. Heh.
Bobby shipped a ton of his equipment to the office. You can't see the rack he has full of stuff, just off-camera. He was just awesome to work with. Before doing music, Bobby was a lawyer for a long time.
If you want to hear more of Bobby's music, just play Duke Nukem 3D - half the music in that game is his. And it's excellent stuff as well - I listen to it almost every day still.