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Michael Sievert, a former marketing executive at AT&T, Clearwire and Microsoft, has been named chief marketing officer at T-Mobile USA. He starts on the job Monday, filling the shoes of longtime marketing exec Cole Brodman who left the company in May.

Sievert most recently held the CEO title at Discovery Bay Games, a Seattle game maker that’s developing gadgets that interact with the iPad. He joined that company in May.

“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, in a statement. “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.”

At Microsoft, where Sievert worked from 2002 to 2005, he served as Corporate Vice President of the Global Windows Group. Before that, he worked for three years as chief marketing officer at AT&T Wireless.

Acting Chief Marketing Officer Andrew Sherrard, who filled the role after Brodman left, will return to his position as senior vice president of marketing for T-Mobile’s contract business.

The appointment of Sievert comes at a period of transition for T-Mobile, which is in the process of acquiring Metro PCS.

It also comes two months after Legere, a former Global Crossing executive, was named as CEO.

But here’s what we really want to know: What does Sievert think of the ultra-hip motorcycle-riding Carly?

Update: Here is the statement from Discovery Bay:

“We think the world of Mike and are happy to have a shareholder in the mobile ecosystem. Peter van Oppen, Trilogy Partner and Chairman of our Board, will step in while we search for a new CEO,” said Natalie Dent, Director of PR for Discovery Bay Games. “As you know, we raised $15 million in August led by Trilogy and Logitech, and we are well positioned to continue our mission of creating ‘digital + physical’ gameplay experiences for iOS and other platforms.”

Previously on GeekWire: T-Mobile exec: One major carrier will go down

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