40 under 40

Our 2013 edition of the list features young hotshots who are rocking businesses as diverse as air travel, natural gas, and genetic coding, as well as—if you can believe it— government.

4. John Elkann

40u40 john elkann fiat
  • Age: 37
  • Title: Chairman
  • Company: Fiat

Elkann was picked for the Fiat board at age 21 by his grandfather Gianni Agnelli, the dapper industrialist who built the company into a global powerhouse. After Agnelli's passing, Elkann, thrust to the forefront by the untimely deaths of two potential successors, was named chairman of Fiat and chairman and CEO of Exor, the family's $142 billion holding company with interests in commercial real estate, banking, media, heavy equipment, and the soccer team Juventus. Elkann—known as Jaki within the family—has led a striking turnaround: He stabilized Fiat and oversaw the successful investment in Chrysler, and has reorganized the far-flung family empire.

  @FortuneMagazine - Last updated September 30 2013 03:41 PM ET
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