I retired from the Robotics Institute at Carnegie Mellon University in Pittsburgh. I helped develop an automated sheet metal bending machine in our Rapid Manufacturing Lab. I have also worked on image understanding projects with aerial photos and with medical images. I wrote an Emacs-like command line editor for the Unix shell that was released on the Next machine. I mostly work in C++ but I like Python, Objective-C and Smalltalk 80 also.

I enjoy reading, running, movies, theater, and classical music. I'm a big fan of the Apple Macintosh. I'm a vegetarian, an atheist and gay. I went to grad school in the Philosophy department at the University of Pennsylvania. As an undergrad I majored in math, physics and philosophy.