John W. Day, Jr. is Distinguished Professor Emeritus in the Department of Oceanography and Coastal Sciences, School of the Coast & Environment at Louisiana State University, where he has taught since 1971. He has published extensively on the ecology and management of coastal and wetland ecosystems and has over 100 peer-reviewed publications. He received his PhD in marine sciences and environmental sciences from the University of North Carolina in 1971 working with Dr. H.T. Odum. Since then, he has conducted extensive research on the ecology and management of the Mississippi Delta and deltas in the Mediterranean and Latin America. Charles Hall is a Systems Ecologist who received his PhD under Howard T. Odum at the University of North Carolina at Chapel Hill. Dr. Hall is Professor Emeritus at the College of Environmental Science and Forestry at the State University of New York, and the author or editor of twelve books and nearly 300 scholarly articles. He has worked ortaught in some 30 different countries. He is best known for his development of the concept of EROI, or energy return on investment, which is an examination of how organisms, including humans, invest energy into obtaining additional energy to improve biotic or social fitness. He has applied these approaches to fish migrations, carbon balance, tropical land use change, the extraction of petroleum and other fuels, and how EROI influences the ability of society to achieve different levels of economic and social development. Presently he is developing a new field, BioPhysical Economics, as a supplement or alternative to conventional neoclassical economics, while applying systems and EROI thinking to a broad series of resource and economic issues. Hall's work on EROI has been featured in such media outlets as Scientific American (most recently in April, 2013), Forbes Magazine, and the Discovery Channel.
