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Head of VNU’s ACNielsen North America leaving company

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Haarlem, the Netherlands—VNU announced that Tim Callahan, president of ACNielsen North America, is leaving the company as of Oct. 3 to become CEO of the consumer group at Berwind, an investment management company. VNU said the search for a successor is under way and that a new head of ACNielsen North America will be announced shortly.
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