3. Greg Jensen
Greg Jensen
Co-CEO and co-CIO, Bridgewater Associates
Age: 37
Industry: Finance

Jensen's work overseeing research at the world's largest hedge fund (assets under management: $125 billion) has paid off. Bridgewater's flagship fund is up 25%, while many marquee names are losing money. Jensen also oversaw the rollout of the $10 billion fund Pure Alpha Major Markets in June. Jensen, who started at Bridgewater as an intern while at Dartmouth, believes the firm's unusual culture (articulated by founder Ray Dalio in the form of 300 self-help principles) is the key to the firm's success -- and his own.


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.

Video
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.