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David Leon Clark has over twenty years of experience in information technology systems and solutions and is currently the program manager responsible for the Information Assurance practice of Acton Burnell, Inc. of Alexandria, Virginia. Mr. Clark provides advice, support, and life cycle security consulting to federal and commercial clients. He designed the core curriculum for the Information Security Management (ISM) course of study, a graduate level program for the University of Virginia's School of Continuing and Professional Studies. A professional writer on high-tech topics, he is the author of IT Manager's Guide to Virtual Private Networks, along with numerous technology white papers and marketing literature.