Dustin Moskovitz, Facebook's first CTO, was Mark Zuckerberg's roommate. The two dropped out of Harvard together to move to California and work on Facebook.

Employed by Facebook from: February 2004 - November 2009

Position at Facebook: Cofounder

Where he is now: Cofounder at Asana, investor in tech startups such as Path, Venmo, Flipboard and NationBuilder.