Saw him at California Extreme twice. Once talking about pinball design where he had his computer hooked up to the projector showing the CAD program he uses to design pinball tables. The complexity of it was pretty astounding, not just playfield elements but also plastics, ramps, toys, and the angles of all the shots mapped out. Zoomed out. With the all the layers turned on it looked like a complete mess. It was astounding how complex it all was and that he could still understand it. He also was on the Atari panel later in the day. He had less to say in the Atari panel, but he didn't seem to miss a question or appear out of it at all.