@amszmidt Alan Bawden wrote:
"The original CONS machine used a Knight TV monitor in addition to a Knight keyboard, so this could be the room where the CONS and original CADR machine consoles were located. The Lisp machines themselves were in the room next door along with Greenblatt's Chess machine -- so possibly this picture was taken during some experimenting with the Chess machine. No clue who the guy in the picture is."