A Research Unix Reader says: Joe (Joseph H.) Condon, physicist and circuit designer extraordinaire, although not usually listed as an “author” of UNIX, is an indispensable presence among the group. He wrote much of the Unix Circuit Design System, including sophisticated wire-routing algorithms. He designed superfast specialized machines, including the chess machine Belle (with Thompson), domesticated real telephone switches to our laboratory environment for the experiments of McMahon and others, and made unusual connections to the telephone system that, among other things, let our lab computer detect and announce incoming voice calls.