I thought about starting a company, but that's not where my energy is, it's doing the science. Everything I do is permissively licensed open source (though if I had a chance to work on awesome rendering in a proprietary product I would not turn it down).

I'll also add, I looked into academia and talked to some people about steps in that direction, for example seriously considering taking on teaching a class at UC Berkeley. But I decided that the daily grind of academia was not for me. I think I get to spend a larger fraction of my time actually working on my problems at Google than I would at a university.