John Randolph is Professor Emeritus of Environmental Planning at Virginia Polytechnic Institute and State University. He is former director of Virginia Tech's School of Public and International Affairs and the Virginia Center for Coal and Energy Research. He received the William R. and June Dale Prize for Excellence in Urban and Regional Planning and is the author of Environmental Land Use Planning and Management from Island Press, now in its second edition (2012). Gilbert M. Masters is the MAP (Emeritus) Professor of Sustainable Energy in the Department of Civil and Environmental Engineering at Stanford University. His focus is on energy efficiency and renewable energy systems as keys to slowing global warming, enhancing energy security, and increasing access to energy services in less developed parts of the world. He is author or co-author of a number of books, including Renewable and Efficient Electric Power Systems, now in its second edition (2013) and Introduction to Engineering and Science, now in its third edition (2008).