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.

23. Lyndon Rive (TIE)

40u40 lyndon rive solar city
  • Age: 36
  • Title: Co-Founder and CEO
  • Company: SolarCity

Rive founded his solar energy company with his brother in 2006 (their cousin is Tesla co-founder Elon Musk), and where many firms have stumbled, Rive's has taken off. Shares are up more than 300% since its IPO, and its 68,000 customers represent a sizable chunk of the 300,000 total residential installations in the U.S.

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