Quick Facts
Biography
Michael Sievert is the president and CEO of T-Mobile US, and a member of the company's board of directors. In November 2019, T-Mobile announced that Sievert, then-COO, would become the CEO of the company in May 2020. Sievert ultimately entered the position a month earlier, on April 1, 2020.
Sievert started his career at Procter & Gamble. He subsequently worked at IBM and Clearwire. He was also executive vice president (EVP) and chief global marketing and sales officer at E-Trade and CEO of tablet gaming company Discovery Bay Games. From 2002 to 2005, Sievert was EVP and CMO of AT&T Wireless. He joined Microsoft's Global Windows Group as CVP of product management in 2005, leading preparations for the release of Longhorn (later called Windows Vista). In 2008 he co-founded Switchbox Labs, a startup acquired by Lenovo in 2009. In 2012, John Legere, T-Mobile's then-new CEO, hired Sievert as CMO.
Sievert became COO of T-Mobile in 2015, and then became the company's president in 2018. In October 2017, he joined the board of Canadian company Shaw Communications.