Maureen Cropper is a professor of economics at the University of Maryland, a University Fellow at Resources for the Future, and a former lead economist at the World Bank. Ms. Cropper is former chair of the Environmental Protection Agency Science Advisory Board Environmental Economics Advisory Committee, and past president of the Association of Environmental and Resource Economists. Her research has focused on valuing environmental amenities (especially environmental health effects), on the discounting of future health benefits, and on the tradeoffs implicit in environmental regulations. Her recent research has focused on the externalities associated with motorization, and on the interaction among residential location, land use, and travel demand.

Robert Hahn is co-founder and executive director of the AEI-Brookings Joint Center, and a resident scholar at AEI. Previously, he worked for the President’s Council of Economic Advisers. He also has served on the faculties of Harvard and Carnegie Mellon University. Mr. Hahn frequently contributes to leading scholarly journals and general-interest periodicals, including The American Economic Review, The Yale Law Journal, Science, and the New York Times. He is the author of In Defense of the Economic Analysis of Regulation (AEI-Brookings Joint Center, 2005) and several other books. In addition, Hahn is co-founder of the Community Preparatory School, an inner-city middle school in Providence, Rhode Island, that provides opportunities for disadvantaged youth to achieve their full potential.

Cass Sunstein is the Karl N. Llewellyn Distinguished Service Professor of Jurisprudence in the School of Law and Department of Political Science at the University of Chicago. Mr. Sunstein is a former law clerk to Justice Thurgood Marshall and was the attorney-advisor in the Department of Justice. He is the author of many books, including After the Rights Revolution (1990), Free Markets and Social Justice (1997), Laws of Fear: Beyond the Precautionary Principle (2005), and Republic.com 2.0 (2007). His edited books include Administrative Law and Regulatory Policy (1998, with Stephen Breyer, Richard Stewart, and Matthew Spitzer). He has testified before Congressional committees on many topics in regulation and administrative law, and has participated in constitution-making and law-reform activities in many nations, including Russia, Ukraine, South Africa, Poland, and China.

Michael Toman is a senior economist and director of the RAND Corporation’s Environment, Energy, and Economic Development Program, part of RAND’s Infrastructure, Safety, and Environment Department. Prior to joining RAND, Mr. Toman worked on policy and project development in the Environment Division, Sustainable Development, at the Inter-American Development Bank. His responsibilities included coordinating the bank’s programs on sustainable energy and climate change. Before joining the bank, Mr. Toman worked for a number of years as a researcher and research manager at Resources for the Future, with involvement in a number of topic areas including energy, climate change, and sustainable economic development. During 1994–96, he was a senior staff economist for the President’s Council of Economic Advisers, where he handled energy and environmental issues. Mr. Toman is the author of numerous articles, journals, and other scholarly works. He is an adjunct faculty member at the Nitze School of International Studies, Johns Hopkins University.