Mr. Sievert has served as our Vice Chairman and Vice Chairman of the Board since 2025. Mr. Sievert served as our President and Chief Executive Officer from April 2020 to November 2025, our Chief Operating Officer from February 2015 to June 2018 and our President and Chief Operating Officer from June 2018 to April 2020. From April 2013 to February 2015, he served as our Executive Vice President and Chief Marketing Officer, and from November 2012 to April 2013, Mr. Sievert was Executive Vice President and Chief Marketing Officer of T-Mobile USA. Prior to joining T-Mobile USA, Mr. Sievert was an entrepreneur and investor involved with several Seattle-area start-up companies. From April 2009 to June 2011, he was Chief Commercial Officer at Clearwire Corporation, a broadband communications provider, responsible for all customer-facing operations. From February 2008 to January 2009, Mr. Sievert was co-founder and Chief Executive Officer of Switchbox Labs, Inc., a consumer technologies developer, leading up to its sale to Lenovo. He also served from January 2005 to February 2008 as Corporate Vice President of the worldwide Windows group at Microsoft Corporation, responsible for global product management and P&L performance for that unit. Prior to Microsoft, he served as Executive Vice President and Chief Marketing Officer at AT&T Wireless for three years. He also served as Chief Sales and Marketing Officer at E*TRADE Financial and began his career with management positions at Procter & Gamble and IBM. He has served on the boards of Rogers Wireless Communications in Canada, Switch & Data Corporation, and a number of technology start-ups. Mr. Sievert holds a Bachelor's degree in Economics from the Wharton School at the University of Pennsylvania. Qualifications and Skills Supporting Election to the Board: Expertise in telecommunications and technology industries Core business, management and leadership expertise; former President and Chief Executive Officer of T-Mobile US, Inc.