Author of Three Worlds Collide and Harry Potter and The Methods of Rationality, the shorter works Trust in God/The Riddle of Kyon and The Finale of the Ultimate Meta Mega Crossover, and various other fiction. Helped found and is probably the most prolific poster to the blog/discussion site Less Wrong, and is currently writing a book on rationality. His day job is with the Singularity Institute for Artificial Intelligence, specifically working on how to make an AI that won't just kill us all accidentally, and make AI less of a crapshoot. Occasionally drops by our very own forums.