This question comes from a position of good faith and mere curiosity, but I've always been intrigued how Sam became prominent in YC so quickly (part time partner to running things in 3 years)? I know he founded Loopt but that's all I knew about him before he became a partner. Did PG just really get on well with him and saw someone capable to help take things over? It sorta feels like an inspirational story worth knowing more about.

(As I say, this merely comes from a position of curiosity. Sam seems to be a very capable guy and seems to have done a good job.)