T-Mobile Taps Sievert to Succeed Turnaround CEO John Legere (1)

T-Mobile US Inc. President and Chief Operating Officer Mike Sievert will take over May 1 from John Legere as chief executive officer, with the company promising continuity as the driving force of its recent success departs.

Legere, 61, the shaggy-haired, self-appointed industry rebel who led T-Mobile out of fourth place among wireless carriers to the brink of a merger deal with Sprint Corp., is leaving April 30 at the end of his current contract but will remain a board member. The move is a long-planned transition.

“As the architect of the Uncarrier strategy and the company’s complete transformation, ...