In the more than two decades that she has spent helping build a fledgling music-video channel into one of the most powerful global media brands, Judy McGrath, 51, has always stayed in touch with what she likes to call her "inner teen." Now that she has taken over the reins at all of parent company Viacom's vast, fast-growing cable operations, including MTV, MTV2, VH-1, CMT, Nickelodeon, TV Land and Comedy Central, you might think she would need to get more in tune with her outer adult. But being responsible for the crown jewel of Sumner Redstone's empire--generating nearly $3 billion in...

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