T-Mobile USA names Michael Sievert chief marketing officer T-Mobile USA announced the appointment of Michael Sievert, as the company's new chief marketing officer, effective November 19. Most recently, Sievert served as CEO of Seattle-based Discovery Bay Games. Andrew Sherrard, who has been serving as acting CMO since spring 2012, will return to his position as senior VP of marketing for T-Mobile's contract business.
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