Joseph Anthony Tainter (born December 8, 1949) is an American anthropologist and historian. Biography Tainter studied anthropology at the University of California, Berkeley and Northwestern University, where he received his Ph.D. in 1975. he holds a professorship in the Department of Environment and Society at Utah State University. His previous positions include Project Leader of Cultural Heritage Research, Rocky Mountain Forest and Range Experiment Station, Albuquerque, New Mexico and Assistant Professor of Anthropology at the University of New Mexico. Tainter has written and edited many articles and monographs. His best-known work, The Collapse of Complex Societies (1988), examines the collapse of Maya and Chacoan civilizations, and of the Western Roman Empire, in terms of network theory, energy economics and complexity theory. Tainter argues that sustainability or collapse of societies follow from the success or failure of problem-solving institutions and that societies collapse when their investments in social complexity and their energy subsidies reach a point of diminishing marginal returns. He recognizes collapse when a society involuntarily sheds a significant portion of its complexity. With Tadeusz Patzek, he is author of Drilling Down: The Gulf Oil Debacle and Our Energy Dilemma, published in 2011. Joseph Tainter is married to Bonnie Bagley and they have one child, Emmet Bagley Tainter. Social complexity As described in Tainter's Collapse of Complex Societies, societies become more complex as they try to solve problems. Social complexity can be recognized by numerous differentiated and specialised social and economic roles and many mechanisms through which they are coordinated, and by reliance on symbolic and abstract communication, and the existence of a class of information producers and analysts who are not involved in primary resource production. Such complexity requires a substantial "energy" subsidy (meaning the consumption of resources, or other forms of wealth). When a society confronts a "problem," such as a shortage of energy, or difficulty in gaining access to it, it tends to create new layers of bureaucracy, infrastructure, or social class to address the challenge. Tainter, who first identifies seventeen examples of rapid collapse of societies, applies his model to three case studies: The Western Roman Empire, the Maya civilization, and the Chaco culture. For example, as Roman agricultural output slowly declined and population increased, per-capita energy availability dropped. The Romans "solved" this problem by conquering their neighbours to appropriate their energy surpluses (as metals, grain, slaves, other materials of value). However, as the Empire grew,