Dissatisfaction is one of the hallmarks of youth culture

Dissatisfaction is one of the hallmarks of youth culture. Everything sucks, right?

Some young people just accept this as fact, toeing the line and sinking into a state of inertia and apathy. But then there are the others, those audacious ones who set out to shake things up--sometimes with dizzying success.

Every year we profile high-earning entrepreneurs who are 30 or younger. This time around, we've come up with a group of revolutionaries who are truly disrupting their respective industries. Whether it's turning the entrenched cell phone service model on its head, reinventing the time-honored (yet unwieldy) real-estate transaction or reimagining audio equipment in an affordable and sustainable way, these young businesspeople had the creativity, smarts and cojones to find--and capitalize on--solutions to nagging obstacles they faced.

These young entrepreneurs are not only doing what they love, they are raking in the proceeds. And if some of them seem a bit cocky, a bit punk--well, they've earned that right. They fought back and won. A bit of braggadocio comes with the territory.