English computer scientist, essayist, entrepreneur, investor, and author. Known for his work on the programming language Lisp, co-founding Viaweb (later Yahoo! Store), and co-founding Y Combinator.

In Search of Antifragility. Into volatility, bitcoin, complex systems, marketing and UT football. Trying to at least be wrong in interesting ways.

Fitter, happier and more productive. Currently @stripe.