40. Brian L. Roberts
40. Brian L. Roberts
Chairman and CEO, Comcast

Roberts has transformed a formerly staid local cable provider into a global media powerhouse. Comcast is currently digesting last year's acquisition of NBC Universal and has signed a major deal for U.S. TV rights to the next four Olympic Games. Comcast's ambition is to control the delivery of digital media, increasingly using cloud-based technology. Risks: Roberts faces intense competition across the rapidly changing media industry, from other cable companies to telcos, satellite companies, Netflix and more.

By Richard McGill Murphy, contributor @FortuneMagazine - Last updated November 17 2011: 5:58 PM ET
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