T-MOBILE. UPDATE - Key Persons
Job Titles:
- President of T - Mobile for Business
- President, Business Group
- President, T - Mobile Business Group
As president of T-Mobile for Business, Callie Field leads an innovative and nimble team that leverages the nation's largest, fastest, and most advanced 5G network to deliver next-generation solutions to customers across the U.S. Callie's extensive sales expertise and obsession with creating happy customers and deepening relationships has inspired the award-winning sales and care organizations that she has led. She empowers her team to develop innovative, best-in-class experiences that address the needs of business and government customers, disrupting their respective industries while providing exceptional service to their clients.
She began her career at T-Mobile in retail, where she was renowned as the company's highest-performing sales leader year after year, eventually becoming the company's chief customer experience officer. In that role, she built the care and digital teams that deliver T-Mobile's legendary customer experiences and was the leading architect of the company's patented Team of Experts - or TEX - a personalized approach to customer service that revolutionized the wireless industry and beyond. This breakthrough customer service model was featured in Harvard Business Review, The Frictionless Organization, Joy Works: Empowering Teams in the New Era of Work and the Girls in Tech podcast. During Callie's time in her role leading care and digital, the team was recognized with a record-setting 23 J.D. Power Awards nine years in a row.
Callie is insatiably curious, constantly learning, and energized by celebrating wins. She actively drives inclusion and belonging within the company and currently serves as Executive Sponsor of T-Mobile's Veterans and Allies Network. She also sits on the boards of the U.S. Chamber of Commerce and DialPad, an AI-powered customer intelligence platform, and previously served on the boards of ServiceMax and the Asian University for Women.
Callie has a Bachelor's degree in Literary Studies from Bard College at Simon's Rock and a Juris Doctor and a Master of Business Administration from Texas Tech University. She has completed executive leadership certificates in financial management at MIT and disruptive innovation at Harvard Business School.
Job Titles:
- Chief People Officer
- Executive Vice President
- Executive Vice President and Chief People Officer at T - Mobile
As executive vice president and chief people officer at T-Mobile, Deeanne King leads a multifaceted team that's focused on one of the company's top priorities-its people. Overseeing human resources, employee experience and corporate real estate, she is responsible for delivering support, learning and development opportunities for all T-Mobile employees across the nation. Under Deeanne's leadership, the team recruits the best and the brightest talent and ensures they flourish in the company's Un-carrier culture. It's her mission to see that all T-Mobile employees can learn, grow, recharge, and thrive in their careers in an open and encouraging workplace.
Deeanne spent 31 years at Sprint where she held several leadership positions, including chief human resources officer, chief diversity officer, and vice president of customer care before joining T-Mobile in 2020 as part of the merger. She was an instrumental force in the integration of the company's historic successful merger with Sprint that blended two distinct cultures and headquarters into one cohesive Team Magenta, leading the entire employee journey from onboarding to leadership development. She spearheaded the 2021 T-Mobile HQ remodel in Bellevue, Washington, that was featured as one of the "Coolest Offices in North America" by Business Insider.
During Deeanne's time in her role, T-Mobile has been awarded "The Best Place to Work" by Glassdoor, Forbes, and Fortune and recognized as one of Newsweek's "Most Admired Workplaces."
Originally from Kansas City, Missouri, Deeanne holds a Bachelor's degree in Business Administration in computer information systems from Baylor University. She serves as a board member of the Kansas City Chamber of Commerce and passionately cheers for the Kansas City Chiefs. She lives in Bellevue, Washington and enjoys time on the water and in the beautiful outdoors, spending quality time with her husband and two grown children.
Dominique Leroy has served as a director of T-Mobile since November 2020, and is a member of the Nominating and Corporate Governance Committee of T-Mobile's Board of Directors. Since November 2020, Ms. Leroy has served as a member of the Board of Management of Deutsche Telekom AG. Ms. Leroy has over 30 years of experience in the consumer goods and telecommunication sector. She started her career at Unilever where her last position was Managing Director for Belgium and Luxembourg. In 2011, she joined Proximus (formerly Belgacom) where she quickly became Head of the Consumer Market and held the position of CEO from 2014 to 2019. As the CEO of Proximus, she managed to turn around the company with a continuous growth phase and a strong customer experience focus. Ms. Leroy started her career at Unilever where her last position was Managing Director for Belgium and Luxembourg. Ms. Leroy currently serves as a director at Compagnie de Saint Gobain and Hellenic Telecommunications Organization ("OTE"). She has also been a Board Member at Royal Ahold Delhaize, Lotus Bakeries, Proximus, and BICS.
She holds a Master's degree in Commercial Engineering and Management from the Solvay Business School in Brussels.
Job Titles:
- Chairman of the O - RAN Alliance
- Director of T - Mobile
Dr. Abdurazak Mudesir has served as a director of T-Mobile since September 2025. He has also served as the Chief Technology Officer of Deutsche Telekom AG since April 2022 and as the Managing Director of Technology at Telekom Deutschland GmbH since January 2023. Prior to that, since 2018, he held various senior leadership positions at Deutsche Telekom, including Senior Vice President of Technology Service Platform at Telekom Deutschland GmbH and Senior Vice President of Open RAN and Senior Vice President of Architecture and Innovation at Deutsche Telekom.
Dr. Mudesir serves as the Chairman of the O-RAN Alliance, the Chairman of the Supervisory Board of PASM Power and Air Solutions and a member of the Board of Directors of Telecom Infra Project.
Dr. Christian P. Illek has served as a director of T-Mobile since November 2018, and is a member of the CEO Selection Committee, Compensation Committee, Executive Committee, and Transaction Committee of T-Mobile's Board of Directors. Since January 2019, Dr. Illek serves as the Chief Financial Officer of Deutsche Telekom, our significant stockholder and a leading European telecommunications company. Since April 2015, he has been a Member of the Management Board of Deutsche Telekom: First as Chief Human Resources Officer (April 2015 to December 2018), then as Chief Financial Officer (January 2019 onwards). Dr. Illek currently serves as Chairman of the Supervisory Board of Telekom Deutschland. From January 2019 to February 2024, he served as Chairman of the Supervisory Board of Deutsche Telekom Services Europe. Furthermore, he served as Chairman of the Supervisory Board of T-Systems International from November 2016 to June 2021. Dr. Illek was Chairman of the Management Board of Microsoft Germany from September 2012 to March 2015. From April 2010 to September 2012, he was Director of Marketing at Telekom Deutschland. In this position, he was responsible for all marketing activities for both consumers and business customers in Germany. He also was in charge of the Wholesale Center, the Value- Added Services Center, and international product development for Deutsche Telekom's fixed network, IP TV, and business customer portfolio. Before joining Deutsche Telekom, Dr. Illek held various managerial positions at Bain and at Dell, both in Germany and Switzerland.
James J. Kavanaugh has served as a director of T-Mobile since July 2023 and, after August 1, 2023, a member of the Audit Committee of T-Mobile's Board of Directors. Mr. Kavanaugh has been the chief financial officer of International Business Machines Corporation ("IBM") since January 2018, overseeing accounting and controllership, financial planning and analysis, tax, internal audit, investor relations, corporate strategy, corporate development and treasury of the company's worldwide financial operations. Prior to that, he was senior vice president, Transformation & Operations, where he was responsible for redesigning IBM's operating model to align with fundamental market shifts and driving new ways of working while incorporating speed and agility through the enterprise. In his current role as the CFO, Mr. Kavanaugh continues to oversee Transformation & Operations, including the Chief Information Office, as well as the company's Global Chief Data Office, Enterprise Operations & Services and Real Estate Operations. Mr. Kavanaugh first joined IBM in 1996 from AT&T Corporation, where he was the chief financial officer, Americas Global Services. He earned his Master of Business Administration degree from The Ohio State University.
Job Titles:
- Chief Information Officer
- Executive Vice President
Job Titles:
- President of Technology & Chief Technology Officer
Job Titles:
- President, Consumer Group
Letitia A. Long has served as a director of T-Mobile since June 2021, and is a member of the Nominating and Corporate Governance Committee of T-Mobile's Board of Directors. Ms. Long currently serves on the Virginia Tech Board of Visitors and the Chair of the Board of the Intelligence & National Security Alliance. Ms. Long currently serves on the board of directors of Parsons Corporation, Corporate Office Properties Trust Defense Properties, and certain private companies. She previously served on the board of directors of Urthecast Corporation from 2015-2018, the board of directors of Raytheon Company from 2015-2020, and the board of directors of Sonatype from 2017-2019. Additionally, she was the Deputy Director of Naval Intelligence for the Department of Defense from 2000-2003, the Deputy Undersecretary of Defense Intelligence (Planning, Policy & Resources) from 2003-2006, the Deputy Director of the Defense Intelligence Agency from 2006-2010, and the Director of the National Geospatial-Intelligence Agency from 2010-2014.
Ms. Long received her Bachelor of Science in Electrical Engineering from Virginia Polytechnic Institute and State University and her Master of Science in Engineering from The Catholic University of America.
Job Titles:
- Co - Chair of Digital Data Design ( D 3 ) Institute
- Director of T - Mobile
Marcelo Claure has served as a director of T-Mobile since April 1, 2020, and is a member of the CEO Selection Committee, Compensation Committee, Executive Committee, and Transaction Committee of T-Mobile's Board of Directors. Mr. Claure is a global entrepreneur and investor, and Founder & CEO of Claure Group, a multibillion-dollar global investment firm spanning multiple high-growth sectors, including AI & technology, energy transition, fashion and entertainment, and sports. Through his investment firm, Claure Group, Mr. Claure provides strategic capital and expertise to many of his portfolio companies' and funds' management teams, including SHEIN, the fastest growing on-demand fashion company globally, where he is Group Vice Chairman; Brightstar Capital Partners, a private investment firm focused on middle-market companies, where he is Co-Chairman, Bicycle Capital, Latin America's leading growth equity fund; Open Opportunity Fund, a fund supporting Black and Hispanic tech founders in the US; and eB Capital, a Brazil-focused investment platform.
Additionally, Mr. Claure is the Co-Chair of Digital Data Design (D^3) Institute at Harvard Business School, an organization which focuses on shaping the future of business and society through digital and AI-driven business initiatives. Mr. Claure served as the Chief Executive Officer of SoftBank International and the Chief Operating Officer of SoftBank from May 2018 until January 2022. In addition, Mr. Claure served as a director of SoftBank from 2017 to 2020. He was also Executive Chairman of WeWork from October 2019 until January 2022. Previously, Mr. Claure served as Sprint's President and Chief Executive Officer, serving as President from August 2014 until January 2018 and as Chief Executive Officer from August 2014 until May 2018. Mr. Claure was Executive Chairman of Sprint prior to the Sprint Combination and served on the Sprint board of directors. Prior to joining Sprint, Mr. Claure was Chief Executive Officer of Brightstar Corp., a company he founded in 1997 and grew from a small Miami-based distributor of mobile device accessories into a global business with more than $10 billion in gross revenue for the year ended 2013.
Mr. Claure received a B.S. in Economics and Finance and an honorary Doctorate of Commercial Science from Bentley University. He also received an honorary Doctorate of Laws from Babson College. He is also an Executive Fellow at Harvard Business School.
Mark Nelson - Chief Legal Officer, EVP
Job Titles:
- Executive Vice President
- General Counsel
Job Titles:
- President, Marketing, Strategy & Products
Job Titles:
- Chief Executive Officer
- President
- Chief Executive Officer, President, and Board Director at T - Mobile US, Inc
Mike Sievert is chief executive officer, president, and board director at T-Mobile US, Inc. He leads a customer-obsessed team of tens of thousands who are disrupting a tired category, putting customers first, and focusing on their mission to become the best in the world at connecting customers to their world.
Mike Sievert is president and chief executive officer of T-Mobile and is a member of the Executive Committee and Transaction Committee of T-Mobile's Board of Directors. Mr. Sievert served as 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. He currently serves on the Starbucks board of directors.
Mr. Sievert holds a Bachelor's degree in Economics from the Wharton School at the University of Pennsylvania.
Job Titles:
- Executive Vice President & Chief Product and Digital Officer
Job Titles:
- Chief Financial Officer
- Executive Vice President
Raphael Kübler has served as a director of T-Mobile since April 30, 2013, and is a member of the Compensation Committee, Executive Committee, and Nominating and Corporate Governance Committee of T-Mobile's Board of Directors. In January 2014, Mr. Kübler assumed the position of Senior Vice President of the Corporate Operating Office of Deutsche Telekom, T-Mobile's majority stockholder and a leading integrated telecommunications company, and reports directly to the Chief Executive Officer of Deutsche Telekom. From July 2009 to December 2013, Mr. Kübler served as a Senior Vice President Group Controlling at Deutsche Telekom. In this position, he was responsible for the financial planning, analysis, and steering of the overall Deutsche Telekom Group as well as the financial management of central headquarters and shared services. From November 2003 to June 2009, Mr. Kübler served as Chief Financial Officer of T-Mobile Deutschland GmbH, the mobile operations of Deutsche Telekom in Germany now known as Telekom Deutschland GmbH (a wholly owned subsidiary of Deutsche Telekom). Mr. Kübler has previously served on the board of directors of Hellenic Telecommunications Organization (OTE) from 2013 to 2018 and Ströer SE & Co. KGaA from 2018 to 2022.
Mr. Kübler studied Business Administration at H.E.C. in Paris and the Universities of Bonn and Cologne. He holds a doctoral degree from the University of Cologne.
Srikant M. Datar has served as a director of T-Mobile since April 30, 2013, and is the chair of the Audit Committee of T-Mobile's Board of Directors. Mr. Datar is the George F. Baker of Administration and Dean of Faculty of the Graduate School of Business Administration at Harvard University since January 2021. Mr. Datar is a Chartered Accountant and planner in industry and has been a professor of accounting and business administration at Harvard since July 1996. He previously served as a professor at Stanford University and Carnegie Mellon University. Mr. Datar received gold medals upon his graduation from the Indian Institute of Management, Ahmedabad, and the Institute of Cost and Works Accountants of India. Mr. Datar is also a member of the board of directors of ICF International Inc., where he is a member of the corporate governance and nominating committee. Mr. Datar previously served on the board of directors of Novartis AG, where he was also the chairman of the audit and compliance committee, and a member of the chairman's committee, the risk committee, and the compensation committee. He also served on the board of directors of Stryker Corporation, where he was a member of the audit and finance committees.
Mr. Datar holds a Master's degree in Statistics and Economics and a Ph.D. in Business from Stanford University.
Job Titles:
- Executive Vice President, Strategic Advisor
Teresa A. Taylor has served as a director of T-Mobile since April 30, 2013 and has been T-Mobile's lead independent director since May 1, 2013. Ms. Taylor is also a member and chair of the Nominating and Corporate Governance Committee, a member of the Audit Committee and CEO Selection Committee of T-Mobile's Board of Directors. Since April 2011, Ms. Taylor has served as Chief Executive Officer of Blue Valley Advisors, LLC, an advisory firm. Ms. Taylor served as Chief Operating Officer of Qwest Communications, Inc., a telecommunications carrier, from August 2009 to April 2011. She served as Qwest's Executive Vice President, Business Markets Group, from January 2008 to April 2009 and served as their Executive Vice President and Chief Administrative Officer from December 2005 to January 2008. Ms. Taylor served in various positions with Qwest and the former US West beginning in 1987. During her 24-year tenure with Qwest and US West, she held various leadership positions and was responsible for strategic planning and execution, sales, marketing, product, network, information technology, human resources, and corporate communications. Ms. Taylor also is a director of Black Hills Corporation, and was previously a director of NiSource, Inc. and First Interstate BancSystem, Inc., where she served as chair of the compensation committee.
Teresa received a Bachelor of Science degree from the University of Wisconsin-LaCrosse.
Thomas Dannenfeldt has served as a director of T-Mobile since June 2025 and is the Chairman of the Compensation Committee and a member of the Transaction Committee of T-Mobile's Board of Directors. Since April 2020, Mr. Dannenfeldt has served on the Board of Directors of Nokia Oyi ("Nokia"), one of the leading European telecommunications infrastructure providers. He is the Chairman of the Personnel Committee and Chairman of the Audit Committee of the Board of Directors of Nokia. Mr. Dannenfeldt served as the Chairman of the Supervisory Board of Ceconomy AG, the largest European consumer electronic retailer February 2021 to July 2025. Mr. Dannenfeldt previously served as the Chief Financial Officer of Deutsche Telekom AG ("Deutsche Telekom"), from January 2014 to December 2018. Mr. Dannenfeldt started his career at Deutsche Telekom in 1992 and has more than 25 years of experience in various leadership roles in sales, marketing, and finance in the national and international mobile and fixed-line telecommunications business. He also served on the Board of Directors of T-Mobile from 2013 to 2018, Virgin Mobile in the UK in 2003 and 2004, as well as the Chairman of the Board of Directors of EE Limited in 2014 and 2015. He holds a Master's degree in Mathematical Economics from the University of Trier, Germany.
Job Titles:
- Director of T - Mobile
- Member of the Supervisory Board of Deutsche Sporthilfe
Thorsten Langheim has served as a director of T-Mobile since April 30, 2013 and is a member of the CEO Selection Committee, Executive Committee and the chair of the Transaction Committee of T-Mobile's Board of Directors. Mr. Langheim joined the board of management of Deutsche Telekom, T-Mobile's majority stockholder and a leading integrated telecommunications company, on January 1, 2019, where he is responsible for the "USA and Group Development" Board department, overseeing Deutsche Telekom's U.S. business as well as corporate development, portfolio strategy, and group M&A activities. This includes overseeing Deutsche Telekom's 12% stake in BT Group as well as the management of Deutsche Telekom's subsidiaries T-Mobile Netherlands and Deutsche Funkturm. In addition, Mr. Langheim also serves as the Chairman and Co-founder of Deutsche Telekom Capital Partners, where he is responsible for the venture capital and private equity activities of Deutsche Telekom.
Prior to that, from 2009 to December 2018, he first served as Senior Vice President of Corporate Development and then as Executive Vice President Group Development at Deutsche Telekom. Prior to his roles at Deutsche Telekom, Mr. Langheim was Managing Director at the Private Equity Group of The Blackstone Group, an asset management and financial services company, from May 2004 to June 2009, primarily focusing on private equity investments in Germany. Before that, Mr. Langheim was Investment Banker and Vice President of European M&A at J.P. Morgan in London and Assistant Director at WestLB in Düsseldorf between 1995 and 2004.
Mr. Langheim is a member of the Supervisory Board of Deutsche Sporthilfe and FC Bayern München AG as well as Chairman of Deutsche Funkturm. Mr. Langheim holds a Master of Science degree in International Securities, Investment, and Banking from the ISMA Centre for Education and Research at the University of Reading (United Kingdom) and a Bachelor's degree (Hons) in European Finance and Accounting from the University of Bremen (Germany) and Leeds Business School (United Kingdom).
Job Titles:
- Chairman of the Board
- Director of T - Mobile
Timotheus Höttges has served as a director of T-Mobile and Chairman of T-Mobile's Board of Directors since April 30, 2013 and is the chair of both the CEO Selection Committee and the Executive Committee of T-Mobile's Board of Directors. Since January 2014, Mr. Höttges has served as chief executive officer of Deutsche Telekom, T-Mobile's majority stockholder and a leading integrated telecommunications company. From March 2009 to December 2013, he served as Deutsche Telekom's chief financial officer (CFO) and a member of the board of management. From December 2006 to March 2009, he was a member of the board of management responsible for the T-Home Unit (fixed-network and broadband business, as well as integrated sales and service in Germany). From January 2003 to December 2006, Mr. Höttges headed European operations as a member of the Board of Management of T-Mobile International. Timotheus also currently serves on the board directors of Mercedes-Benz Group AG and previously served on the board of directors of Henkel AG & Co. KgaA and BT Group plc.
Mr. Höttges studied Business Administration at the University of Cologne.