Andrew P. Sage, PhD, is University Professor and First American Bank Professor at George Mason University in Fairfax, Virginia. He is a Fellow of the IEEE, the American Association for the Advancement of Science, and International Council on Systems Engineering (INCOSE). The winner of numerous awards, Dr. Sage is the editor of the Wiley Series in Systems Engineering and Management and the founding editor of the INCOSE journal Systems Engineering. He is a member of the National Academy of Engineering. William B. Rouse, PhD, is the Executive Director of the Tennenbaum Institute at the Georgia Institute of Technology, and a faculty member in the School of Industrial and Systems Engineering and the College of Computing. A former CEO of two innovative software companies, he has four decades of experience in research, education, engineering, management, and marketing. Dr. Rouse has written hundreds of articles and book chapters and has authored many books. He is a member of the National Academy of Engineering and a fellow of several professional societies.