I work at Spreedly, where we're making it easier than ever to work with payment processors. Previously, I worked at Khan Academy, where I ran the Backend Engineering Team and later the Coached Learning Team, and before that, I founded the Kiln distributed source control system. In my free time, I program in Python and in Pharo, an open-source, cross-platform Smalltalk dialect. You can browse most of my code at my GitHub and Bitbucket accounts.