Started hacking on compilers & web-development tools in the late 1990s. Finished CS undergrad at Carnegie Mellon in 2003 and CS PhD at Berkeley in 2007, picking up mechanized proof of executable, decently practical systems with Coq as a main focus in between. Postdoc at Harvard through 2011, then faculty at MIT since. Author of Certified Programming with Dependent Types, a popular online & in-print introduction to using Coq at scale. Lately into building practical but clean-slate hardware-software stacks with end-to-end Coq proofs of everything digital, at the same time as developing a startup-company idea to trick ordinary people into using dependent types (with Ur/Web) to generate their business applications.