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T-Mobile COO, and new president, Mike Sievert (GeekWire Photo/Kevin Lisota)

T-Mobile has promoted its Chief Operating Officer Mike Sievert to the role of president, according to a filing with the U.S. Securities and Exchange Commission.

Sievert inherits the role of president from John Legere, who will remain CEO. T-Mobile is seeking regulatory approval for the blockbuster acquisition of Sprint, and should the deal go through, Sievert would serve as president and COO of the combined companies, with Legere retaining the CEO role.

Sievert joined T-Mobile in 2012 as its chief marketing officer. He was promoted to the title of COO in 2015.

Sievert is a longtime fixture of the Seattle tech scene, having served as chief commercial officer and chairman of the operating committee at Clearwire and corporate vice president of Microsoft’s Global Windows Group. He also founded a startup called Switchbox Labs that was later acquired by Lenovo.

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