31. Tony Hsieh & Charles Best (tie)
Tony Hsieh & Charles Best (tie)
Tony Hsieh (l) and Charles Best
Hsieh: CEO, Zappos.com
Age: 38
Industry: Apparel

Hsieh still runs Zappos, but he's attained guru status when it comes to building workplaces: His "Delivering happiness" message is now the basis for a bestselling book and a company that exports his philosophy to giants like P&G and Hasbro.

Latest move: Investing in private jet outfit JetSuite.

Best: Founder, DonorsChoose.org
Age: 36
Industry: Nonprofit

Donations for Best's nonprofit, which raises funds for public school classrooms, are on track for $40 million this school year, nearly double from two years ago, and now total $90 million since 2000. Last year his gift card was among Oprah's "ultimate favorite things."

Last updated October 25 2011: 5:11 PM ET
Join the Conversation
Ones to watch

In addition to Fortune's 40 Under 40 list, we're also keeping our eye on these 20 innovators, young guns from a wide range of industries and backgrounds.

Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer Morningstar: © 2014 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2014 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2014. All rights reserved. Most stock quote data provided by BATS.