T-Mobile USA, Inc., today announced the appointment of Michael Sievert, a 20-year marketing veteran of the tech and telecom sectors, as the company's new chief marketing officer, effective Nov. 19. (Photo: Business Wire)“Mike is a unique creative genius, and his track record as a disruptive force in tech and telecom couldn’t be better suited to our plans to redefine wireless as America’s un-carrier,” said John Legere, president and CEO of T-Mobile USA. “This is a critical and incredibly exciting time for T-Mobile as we race forward with our network modernization and LTE launch in 2013, ramp up investments in re-launching our brand, and begin to shake up the U.S. wireless market.” With Sievert’s appointment, Andrew Sherrard — who has been serving as acting CMO since spring 2012 — will return to his position as senior vice president of marketing for T-Mobile’s contract business. “I also want to personally thank Andrew for his leadership during this transition and for the extraordinary work he’s done these past months in moving our brand and our company forward,” Legere added. In his 20 years with companies such as Clearwire, AT&T Wireless, Microsoft, IBM and Procter & Gamble, as well as innovative tech ventures, Sievert showed a flair for transformative change and for shaking up the status quo. At Clearwire, he helped lead that business to over 5x revenue growth and 10x+ customer growth in two short years. Before Clearwire, Sievert’s outside-the-box creativity was on full display as co-founder and CEO of Switchbox Labs, a startup focused on pioneering technologies for Internet TV (and which he successfully sold to Lenovo). During his time as executive vice president and chief marketing officer at AT&T Wireless, where he spearheaded a series of groundbreaking and highly successful marketing campaigns, Sievert was twice named as one of the 25 most influential marketers in the U.S . by Advertising Age. He previously served as executive vice president, chief global marketing and sales officer, at E*Trade. Sievert has also served on the board of directors at Rogers Wireless, Switch and Data, and a number of venture-backed private companies over the years. Most recently, Sievert served as CEO of Seattle-based Discovery Bay Games, a global leader in mobile and tablet gaming accessories. Sievert continues to be a significant shareholder and supporter of Discovery Bay Games.