I dropped out of a philosophy Ph.D. program at Stanford and landed in Silicon Valley. I was an early employee at AdMob, where I co-created a product that accounted for half of the company's revenue at the time of acquisition. I co-founded card.io, a mobile computer vision company, which was acquired by PayPal. I have worked on the Go compiler and core for a few years for fun; I am the most prolific non-Google contributor. I am working on a new company now.