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Mike Sievert
Mike Sievert

Mike Sievert has been named the Chief Operating officer of T-Mobile, according to a new SEC filing from the Bellevue-based carrier.

Sievert, who previously served as T-Mobile’s Chief Marketing Officer, will be taking over the job from Jim Alling, who announced that he plans to step down next month. Sievert is a longtime fixture of the Seattle tech scene, having served as the Chief Commercial Officer and Chairman of the Operating Committee at Clearwire, the corporate vice president of Microsoft’s Global Windows Group and as the founder of a few area startups.

The reasons for Alling’s departure were not disclosed, though he’ll remain with the company through March 13.

In addition to Sievert’s promotion, T-Mobile also appointed Tom Keys president of T-Mobile Indirect Channels. Keys previously served as the executive vice president and Chief Operating Officer of MetroPCS Business.

News of the executive shifts comes just a day before T-Mobile will release its earnings report for the fourth quarter of 2014. Preliminary results showed record customer growth during the quarter, but that won’t be enough for T-Mobile to unseat Sprint as the third-largest wireless carrier in the country.

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