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John Middlebrook, 63, a 45-year General Motors Corp. veteran, will become vice president of global sales, service and marketing, a new position, Sept. 1. Mark LaNeve, general manager of Cadillac, will replace Middlebrook as vice president of North American marketing and advertising. Jim Taylor, 47, vehicle line executive of Cadillac cars, will replace LaNeve; Mike DiGiovanni, 56, Hummer general manager, will become executive director of strategic marketing, a new position; and Susan Docherty, 41, will become Hummer general manager.
