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Mr. Zufall has been Senior Vice President, Network Systems since January 2, 2006. During the five years prior to joining the Company, Mr. Zufall served in a number of technical and operational capacities at Nextel Communications, Inc, including Vice President, Infrastructure Technology Development and Vice President, Network Architecture/Chief Architect. Nextel operated a nationwide digital cellular network in the United States. Mr. Zufall had responsibility for working with partners in Nextel's strategy and marketing divisions to establish Nextel's long-term network and technology roadmap. Mr. Zufall holds a Bachelor of Sciences degree in Electrical Engineering and an M.B.A. in Finance and International Business, both from Columbia University. | 