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18. Judy McGrath
Chairman and CEO, MTV Networks
Viacom (VIAB)
2009 rank: 20
Age: 58

Between Jersey Shore and the Video Music Awards, McGrath has jolted MTV out of its ratings slump. Airings of the two shows account for the top 10 cable telecasts of the year among 12 to 34-year-olds.

NEXT: Barbara Desoer
Last updated September 30 2010: 2:47 PM ET
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