T-Mobile announced that CEO John Legere will step down, effective May 1, 2020, and that its board of directors has named current President and Chief Operating Officer Mike Sievert to succeed him.

Sievert will assume the role of president and CEO at the conclusion of Legere’s contract on April 30, 2020. Legere will remain a member of the T-Mobile board of directors.

Mike Sievert. Photo courtesy of T-Mobile.

Legere and Sievert have worked together for more than seven years to develop T-Mobile’s Un-carrier service and branding, while endeavoring to solidify the wireless provider’s proposed merger with Sprint — which is expected to close in 2020 — with a goal of creating the new T-Mobile.

“I hired Mike in 2012 and I have great confidence in him. I have mentored him as he took on increasingly broad responsibilities, and he is absolutely the right choice as T-Mobile’s next CEO,” Legere said of Sievert in a statement.

Legere also noted he would spend the rest of his tenure as CEO endeavoring to provide a smooth leadership transition, while also helping complete the Sprint merger.

“John is a one-of-a-kind, visionary leader who has redefined the role of CEO and demonstrated how to use it to create positive change for customers, employees, and investors alike,” Sievert said in a statement. “I have been fortunate to work together with him to build T-Mobile’s purpose-driven strategy to address customer pain points, an approach that has been the foundation for our unprecedented growth.

“Going forward, my mission is to build on T-Mobile’s industry-leading reputation for empowering employees to deliver an outstanding customer experience and to position T-Mobile not only as the leading mobile carrier, but as one of the most admired companies in America,” Sievert continued.

News of the change in leadership comes on the heels of T-Mobile’s third quarter earnings report last month. The wireless provider reported it had netted more than 1.7 million new customers, and saw service revenue of more than $8.6 billion, up 6 percent from the previous quarter. The company also hopes to speed up the launch of its nationwide 5G coverage for the new T-Mobile, with plans to launch before the end of the year.