Andrew McCollum designed Facebook's first logo and worked on a side project with Zuckerberg called Wirehog.

Employed by Facebook: February 2004 - September 2006

Position: Cofounder, engineer

Where he is now: McCollum joined Flybridge Capital Partners as an entrepreneur in residence in 2011. Then he became a partner at the VC firm NEA. Now he's invested and involved in other tech startups, such as Quilt and JobSpice.