Grey Worldwide reorganized its Western Division offices, naming John Crosson, 38, president-chief operating officer from VP-managing director, and Peter Mooney, 46, president-chief creative officer from exec VP-creative director in the Los Angeles office. In San Francisco, Kieran Hannon, 38, becomes president-chief operating officer from exec VP and co-managing director. They succeed CEO Jeff Alperin, 46, who's leaving. All three will report to Robert Berenson, vice chairman-general manager of Grey Global Group. At the same time, Grey is relaunching its media planning and buying groups in the two cities as MediaCom
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