John Legere, left, and Grant Cardone ... and his family must deal with the damage to his Malibu home on California's west coast after wildfires damaged his oceanfront house.

John Legere, T-Mobile’s influential CEO and cheerleader, is leaving next year T-Mobile CEO John Legere will exit the company in May 2020, leaving COO and President Mike Sievert as his successor.

T-Mobile's outspoken CEO, John Legere, will be stepping down next year and will be replaced by current COO Mike Sievert. The company said Legere will stay on to help T-Mobile complete its $26.5 ...