7. Daniel Ammann
Daniel Ammann
CFO, General Motors
Age: 39
Industry: Automotive

Last fall Ammann spent weeks on the road persuading investors to buy General Motors stock. Now he's working to keep them happy. The native New Zealander advised GM for years as a Morgan Stanley banker before taking over as CFO this spring. His job today: making sure the automaker stays profitable in any market -- historically a tough task for GM. "We're off to a good start," says Ammann, who splits his time between Detroit and New York City; this year GM has earned $6.3 billion in a humdrum economy.

Least favorite business term: "End-to-end solution."

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.