At Facebook, Dustin Moscovitz was VP of engineering. He and Justin Rosenstein worked together at trying to co-ordinate the work of hundreds of new employees. The two went off on their own in 2008 building collaboration tools for businesses and organizations.
For Now Asana is free for groups of up to 30, but a paid version is in the works.
Forbes says that Moscovitz is 27 is worth $3.5 billion.