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.

16. Jeremy Stoppelman

40u40 jeremy stoppelman yelp
  • Age: 35
  • Title: Co-Founder and CEO
  • Company: Yelp

Part online business directory, part customer reviews hub, Yelp has become indispensable for 108 million active monthly users since ex-PayPalers Stoppelman and Russel Simmons started it in 2004. This year it took the concept further with Yelp Platform, letting users buy meals from restaurants directly on Yelp (Stoppelman says services will follow). But plain old advertising is expected to power revenue for the company in the years to come: Sales jumped 69% to $55 million last quarter, trumping Wall Street's expectations (see the feature story on Yelp).

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