T-Mobile CEO John Legere Is Stepping Down in May 2020 Amid Rumors He’s Been Talking to WeWork About Running the Company Posted byBen Gilbert November 18, 2019 Leave a comment on T-Mobile CEO John Legere Is Stepping Down in May 2020 Amid Rumors He’s Been Talking to WeWork About Running the Company The mobile carrier’s chief operating officer and president, Mike Sievert, will take the reins from Legere.