Kevin L. Beebe has been a director since 2004. In 2007, he became president and chief executive officer of 2BPartners, LLC, a partnership that provides strategic, financial and operational advice to private equity investors and management. In 2014, Mr. Beebe became a founding partner of Astra Capital Management, a private equity firm based in Washington, D.C. Previously, beginning in 1998, Mr. Beebe was group president of operations at ALLTEL, a telecommunications services company. From 1996 to 1998, he served as executive vice president of operations for 360° Communications, a wireless communication company. Mr. Beebe has held a variety of executive and senior management positions at several divisions of Sprint, including vice president of operations and vice president of marketing and administration for Sprint Cellular, director of marketing for Sprint north central division, director of engineering and operations staff and director of product management and business development for Sprint southeast division, as well as staff director of product services at Sprint. He began his career at AT&T/Southwestern Bell as a manager. Mr. Beebe also serves as lead independent director for Frontier Communications, a publicly traded provider of communication services, and a director for SBA Communications, a publicly traded operator of wireless communications towers in North, South and Central America, Syniverse Technologies, a privately held provider of support services for wireless carriers, and Logix Communications, a privately held provider of facilities-based communications services. He previously served as chairman of the board of directors of NII Holdings, until December 2019 upon the sale of its sole material asset, and as a director for Altimar Acquisition Corporation and Altimar Acquisition Corp. II, both publicly traded special purpose acquisition companies.