is a professor in the Department of Civil and Environmental Engineering and the Department of Engineering and Public Policy at Carnegie Mellon University. He is also a member of the Green Design Institute, an interdisciplinary research consortium at Carnegie Mellon focused on modeling energy and environmental problems as systems, building decision support tools, and supporting robust policy decisions under uncertainty.

Dr. Matthews has served as chair of the Committee on Sustainable Systems and Technology with the Institute of Electrical and Electronic Engineers and on the Executive Committee for the American Center for Life Cycle Assessment. He participated in the National Research Council studies on the Hidden Costs of Energy and Scientific Tools and Approaches for Sustainability, and is a member of the NRC Board on Environmental Studies and Toxicology. Dr. Matthews has a Ph.D. in Economics from Carnegie Mellon.