Mr. O'Brien is Vice Chairman of Nextel Communications, Inc, a supplier of mobile communications and the country's largest specialized mobile radio operator. He co-founded Nextel in 1987 and served as Chairman of the Board from 1987 to 1996. Previously, he was with the international law firm of Jones, Day, Reavis & Pogue, where he served as Partner-In-Charge of the firm's telecommunications section. Mr. O'Brien has extensive experience in mobile radio and has been a leader in the SMR industry since its inception in the 1970s. He has served as a lawyer with the Mobile Services Division of the Common Carrier Bureau of the Federal Communications Commission (FCC), as a legal advisor for the FCC's Chicago regional experiment in spectrum management for land mobile services, as Assistant Bureau Chief for Spectrum Management of the FCC's Private Radio Bureau and was responsible for authorizing the first licenses granted for SMR operation. He has served on the Boards of Directors of the American Mobile Telecommunications Association and the Cellular Telecommunications Industry Association.

Mr. Puente is currently Chairman of the Executive Committee at Orion Network Systems, Inc.. He is also Chairman of the Board at Telogy Networks, a leading provider of embedded communications software to global equipment manufacturers. Mr. Puente led Orion Network Systems, Inc. as Chairman and Cheif Executive Officer from 1987 through 1993. Previously, he was a Director and served in various capacities for M/A-COM, Inc., a diversified telecommunications and manufacturing company. Mr. Puente was a founder of SouthernNet, Inc., a fiber optic long distance carrier which was subsequently aquired by MCI as Telecom USA; a founder of the National Telecommunications Network, a national consortium of long distance fiber optic communications companies; and a founder of Digital Communications Corporation (DCC), which was subsequently acquired by Hughes Aircraft Company to become Hughes Network Systems, Inc. Mr. Puente received his MSEE from Stevens Institute of Technology, and a BSEE from the Polytechnic University of New York.

Mr. Thompson has been Chairman and Chief Executive Officer of LCI International since July 1991. He and his team led the turnaround of the company and LCI's emergence as one of the nation's fastest-growing long distance telecommunications carriers. He previously served as Executive Vice President of MCI Communications Corp. from 1981-1990, with responsibility for the company's eight operating divisions. Prior to MCI, Mr. Thompson was a management consultant with McKinsey & Company. Mr. Thompson was elected in 1995 to serve as chairman of The Competitive Telecommunications Association (CompTel) and is a commissioner of the Global Information Infrastructure Commission, a multinational organization launched in Brussels in 1995 to chart the role of the private sector in the developing global information and telecommunications infrastructure. He received his MBA from Harvard's School of Business and holds an undergraduate degree in chemical engineering from the University of Massachusetts.

Mr. Thompson is Chairman of the Board, President and CEO of Orbital Sciences Corporation, a space technology and satellite services company which he co-founded in 1982. With 1997 sales of approximately $600 million and a staff of 3,500 people, Orbital is the industry leader in providing affordable space-related products, systems and services to commercial, government and international customers and has been the fastest-growing space-technology enterprise in the U.S. Earlier, Mr. Thompson was Special Assistant to the President of Hughes Aircraft Company's Missile Systems Group and was a NASA project manager and engineer. His honors include the National Medal of Technology, Virginia's Industrialist of the Year, Inc. Magazine's High-Technology Entrepreneur of the Year, the Smithsonian Institute's National Air and Space Museum Trophy and Via Satellite Magazine's Satellite Executive of the Year. He received a BS in Aeronautics and Astronautics from Massachusetts Institute of Technology, MS in Aeronautics from California Institute of Technology and an MBA from Harvard's School of Business.

Mr. Warner has been active in the telecommunications industry since 1982. A founder of Columbia Capital Corporation, he played a key role in the consolidation of the cellular industry. Mr. Warner continues to pursue new prospects as well as oversee several of Columbia Capital's current investments. He was instrumental in the founding of Columbia's four public companies, including Nextel and Saville Systems. He served as Chairman of the Democratic Party of Virginia from 1993-1995 and was a candidate for the U.S. Senate in 1996. He has a BA from George Washington University and a JD from the Harvard Law School. Mr. Warner serves on numerous boards, including Virginia Union University and George Washington University.