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David Calhoun, Nielsen Co.

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What:Chairman-CEO
Where: Nielsen Co.
Why:The former vice chairman of General Electric Co., Calhoun was named to head VNU Group in August 2006, shortly after its acquisition by a consortium of private equity firms; five months later, he oversaw the rebranding of the business as Nielsen Co. Calhoun advocates the unifying concept of “one Nielsen” across the company's diverse business units, which include AC Nielsen, ACNielsen Homescan, Nielsen Business Media, Nielsen Entertainment, Nielsen Media Research and Nielsen Online.
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