Cass used to work with me at NVIDIA. In fact, when I got hired at NVIDIA, he was my mentor in arch. He's stupidly brilliant, and yet somehow not a social retard, which is great. He's over at id now, which is a bummer because he and his family aren't in Austin anymore, but it's cool going up to visit them next to Lake Elron Hubbard.
Anyways, he writes somewhat more regularly than I do over at his blog The Hypothetical Third Dimension. Some of it is math-centric, but he usually follows that up with a segway into his second favorite topic: beer.