We know how to pick 'em. This is Inc.'s 10th 30 Under 30 list, and we've established a solid track record of identifying future superstars. Since 2006, we have profiled Facebook's Mark Zuckerberg; Elizabeth Holmes of Theranos, now a health industry leader and America’s youngest self-made female billionaire; a pre-Y Combinator Sam Altman; and Quirky's Ben Kaufman. We don't have a crystal ball, but we know that energized entrepreneurs with smarts and great ideas are always worth watching. This year's winners are using the new tools available to them (3-D printing, mobile technology, YouTube celebrity) combined with the ageless rules of entrepreneurship (profit is king, figure out what people need and build it, work harder than you ever thought possible) to create ideas with staying power.

Our 2015 honorees are hacking how you sleep, shop, and listen to music. They're making your shoes more comfortable, helping your kids learn more efficiently, providing loans for your business, and serving hearing-impaired people in the developing world. They are innovators, disrupters, and dreamers--and they're just getting started. They're in very good company among our alums, and we look forward to shamelessly bragging, "We knew them when." (We hope you'll vote for your favorite company, too.)