Martin Shubik was Seymour Knox Professor of Mathematical Institutional Economics (Emeritus) at Yale University's Cowles Foundation and School of Management and the author of the three-volume work The Theory of Money and Financial Institutions (MIT Press) and other books. He was also External Faculty of the Santa Fe Institute. Eric Smith is Professor and Principal Investigator at the Earth-Life Science Institute in Tokyo and Research Professor at George Mason University's Krasnow Institute for Advanced Study. He is the coauthor of Symmetry and Collective Fluctuations in Evolutionary Games and The Origin and Nature of Life on Earth. He is External Faculty of the Santa Fe Institute.