We first acknowledge with much gratitude our colleagues Abraham Lerman, Rolf S. Arvidson, and Michael W. Guidry with whom we have had many discussions concerning some of the topics in this Perspectives volume and with whom we have written a number of papers over the years. I (Fred) professionally would like to acknowledge Don Ryan and Keith Chave, my Ph.D. advisors at Lehigh University, for setting me off on the academic track, a path that I have never regretted. Keith also encouraged me to depart from working for Shell Oil Company and start my research career...

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