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December 1999, and currently serves on the Audit Committee. He is the Chairman of the Board of Citel, a company focused on enabling enterprise IP telephony with existing PBX infrustructure. Mr. Heintzelman was the Chairman of the Board of Optelecom, Inc. from February 2000 to June 2003, also serving as the interim President and Chief Executive Officer during 2002. Prior to joining Optelecom, Mr. Heintzelman was the President of Net2000 Communications, from November 1999 to May 2001. From December 1998 to November 1999, Mr. Heintzelman was the President and Chief Executive Officer of SAVVIS Communications Corporation, a networking and Internet solutions company. From 1995 to 1998, Mr. Heintzelman was the President and Chief Operating Officer of DIGEX, Inc. Prior to joining DIGEX, Inc., Mr. Heintzelman was a General Manager for Bell Atlantic. Mr. Heintzelman also serves on the Board of Directors of SAVVIS Communications Corporation and ITC Deltacom. Mr. Heintzelman holds a B.A. degree in Marketing from the University of Delaware. | 