4. Patrick Collison

CEO of Stripe

Collison has provided solution to one of the most important problems in technology: payments. After coming out of Y Combinator, Stripe has made accepting payments online dead simple. You can add a way to pay for things on just about any app.

It came as a great relief for other startups, because payments are the most difficult part of building an application. Stripe does it within a few lines of code.

Companies also don’t need to set up their own commercial bank accounts or store credit card numbers.

3. Joe Fernandez

CEO of Klout

Fernandez, the CEO of Klout is known for always running around and never sitting still. His startup provides a service used by many to evaluate their online influence.

Recently it finished off a big fundraising round and developed a brand new mobile app. It also completed a big redesign of the site that's making it more like a "social resume."