Paul Zarchan has more than 40 years of experience designing, analyzing, and evaluating missile guidance systems. He has worked as Principal Engineer for Raytheon Mission Systems Division and has served as Senior Research Engineer with the Israel Ministry of Defense and has worked as Principal Member of the Technical Staff at C.S. Draper Laboratory. Mr. Zarchan is currently working on problems related to missile defense as a Member of the Technical Staff for MIT Lincoln Laboratory. He is author of Tactical and Strategic Missile Guidance, Fifth Edition and co-author of Fundamentals of Kalman Filtering: A Practical Approach Third Edition, both of which are books in the AIAA Progress in Astronautics and Aeronautics Series.