Combination of things. I'm originally from the Bay Area (Berkeley), so I always wanted to get back (I think I could've gotten into the Chicago winters if I'd picked up following hockey more, but was sort of too late by the time I realized this). The other thing is that pure technology companies really are a bit more exciting in some ways than financial firms, even if they make technology and algorithmic approaches to problem solving their primary focus. Long-term, the Bay Area seemed to make more sense. I sort of believe in the startup mentality more than the Chicago-, zero-sum trading world mentality (though as sort of hinting at, sometimes I miss a little bit of the rigorousness). But it's hard to generalize. Good people in both places.