John J. Legere is an American businessman who is the Chief Executive Officer and President of T-Mobile US. He has previously served as an executive for AT&T, Dell, Global Crossing and serves on the CTIA Board of Directors.

Legere was appointed as the new CEO for T-Mobile USA (now T-Mobile US) in September 2012, and has since been noted for T-Mobile's "uncarrier" approach to contract-free wireless networks. He first worked in telecommunications at New England Telephone. Legere then spent nearly 20 years at AT&T, where he spent a period working under Daniel Hesse, formerly CEO of Sprint Corporation. He served as chief executive for AT&T Asia from April 1994 to November 1997, and he also spent time as head of AT&T Global Strategy and Business Development. From 1997 to 1998, he served as President of Worldwide outsourcing of AT&T solutions.

Legere then worked as Senior Vice President of Dell and President and Chief Operations Officer for Dell's Operations in Europe, the Middle East and Africa and president, Asia-Pacific for Dell from 1998 to February 2000. Prior to joining T-Mobile, he was CEO of Asia Global Crossing from February 2000 to January 2002, and CEO of Global Crossing from October 2001 to October 2011, where he led the organization through bankruptcy and eventually an acquisition by Level 3 Communications.

He received a Bachelors degree in Business Administration from the University of Massachusetts, a Master of Science degree as an Alfred P. Sloan Fellow at the Massachusetts Institute of Technology and a Master of Business Administration degree from Fairleigh Dickinson University, and he completed Harvard Business School's Program for Management Development (PMD).

Legere was a nationally competitive runner in college and post college, and he still competes in events with fellow employees. In 2004, he completed the Boston Marathon as a member of the Dana–Farber Cancer Institute Marathon Challenge team.

Business, Business Leadership, CEO, Chief Executive Officer (CEO), Leadership, Business Founders Executive Leadership,