Our Terms of Service and Privacy Policy have changed.

By continuing to use this site, you are agreeing to the new Privacy Policy and Terms of Service.

4. Aditya Mittal
Aditya Mittal
CFO, ArcelorMittal
Age: 35
Industry: Industrial

He's more than just the son of his company's billionaire founder: The finance whiz helped build the world's biggest steel group through acquisitions -- and is now helping run it. This year he assumed responsibility for European operations, the company's largest division, and he just returned from the Arctic, where the company's new iron ore mine is one of billions of dollars' worth of new projects.

Media diet: He reads the state-controlled China Daily every day "to get perspective on how they are framing the news."

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.

Search for Jobs