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.

37. Dhiraj Rajaram

40u40 dhiraj rajaram mu sigma
  • Age: 39
  • Title: Founder and CEO
  • Company: Mu Sigma

This former consultant (Booz Allen and Price Waterhouse) has rocked the world of big data with his eight-year-old firm, which provides data and analytics services to a quarter of the companies on the Fortune 500. Recent investments from MasterCard and Fidelity have pushed the Sequoia- and General Atlantic-backed company's valuation to more than $1 billion and made it a rumored buyout target. Analysts at the 2,500-person firm, based in Chicago, Bangalore, and Austin, are trained at an in-house math factory called the Mu Sigma University; Rajaram, who grew up in Chennai, runs it from India and the U.S. The company's name comes from the statistical symbols for "mean" and "standard deviation," and conference rooms are named after statistical distributions.

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