Ezra Callahan had been roommates with Sean Parker and was hired to "whittle away" at Eduardo Saverin's CFO responsibilities.

Employed by Facebook: December 2004 - July 2010

Position: Manager of Internal Communications, Product Manager

Where he is now: Callahan hasn't updated his LinkedIn profile since he left Facebook, but his Facebook profile shows that he lives in Pasadena, California with his family. A few years ago, he decided to invest in a Palm Springs hotel after he noticed millennials flocking there. Condé Nast Traveler dubbed it the "hotel of the future."