10. Justin Kan

CEO of Exec

Exec CEO Justin Kan holds the record for running three companies through Y Combinator. He left his first company Justin.tv in the hands of CEO Emmett Shear. He's one of the most connected founders in Silicon Valley. Now he is on his third company, a startup called Exec that lets you hire professionals to complete just about any task for $ 25 an hour. The effective use case that's emerged is replacing the office manager with Execs.

9. James Beshara

CEO of Crowdtilt

Crowdtilt is solving a pretty common problem. Imagine this: you're at a restaurant with a big group of friends and the check comes around — then 9 credit cards hit the table.

Beshara, a true gentleman and having faced this problem, decided to start Crowdtilt, a crowd-funding site for small-scale projects that range anywhere from a party boat to dinner with friends.