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.

7. Chris Weideman

40u40 chris weidman jack lew
  • Age: 38
  • Title: Chief of Staff
  • Company: U.S. Treasury Department

This Stanford Law grad was tapped in April to become newly installed Treasury Secretary Jack Lew's right-hand man, just in time to help navigate the department rattling IRS scandal. Weideman earned the job by distinguishing himself as a go-to fixer for Tim Geithner, so he knows how to handle an emergency. Now he's sweating longer-term challenges too: a comprehensive rewrite of the tax code, the ongoing budget battles with congressional Republicans, and international headaches from Europe to China. That's a tall order.

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