Age: 26
Company: Facebook
Net Worth: $1.4 Billion
What's the Deal?: As one of the four founders of the Facebook empire, Moskovitz stands atop a 6% ownership share that dwarfs almost everyone on this list. Now past the days of the infamous social network, the FB alumni is working on his new start-up, Asana, which builds project management software to help push workplace productivity. If anyone knows about being productive, it's this dude.