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David Lamb, 44, to worldwide marketing director of the Diamond Trading Company (formerly DeBeers), London, from exec VP-director of multinational clients at JWT, London, where he was previously the global business director handling JWT client DTC. He is succeeded by Guy Chauvel, 47, chairman-CEO of JWT France.

Toby Hoare, 45, to executive chairman of JWT U.K., from CEO of Team HSBC, part of JWT's parent company WPP Group. Mr. Hoare succeeds Simon Bolton, who is "discussing his next role within the company," according to JWT.

Suresh Nair, 46, and Nat Puccio, 50, to exec VPs and co-directors, global strategic planning at Grey Worldwide, New York. The pair move from McCann Erickson Worldwide, where they were exec VP chief strategy officers for North America.

Herve Philippe to chief financial officer, Havas, Paris, from the same post at French high-tech and electronics group Sagem. He succeeds Jacques Herail, who is leaving the company.

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