Nathaniel Keohane is Director of Economic Policy and Analysis in the New York office of Environmental Defense.

     Nat works to develop and advocate environmentally responsible and economically sound climate policies aimed at reducing emissions of greenhouse gases. He seeks to bring economic theory and empirical analysis to bear on questions such as the optimal design of cap-and-trade systems and the long-term impacts of climate policy on the U.S. economy. Nat's research focuses on the design and performance of market-based environmental policies.

     Nat holds a Ph.D. in Political Economy and Government from Harvard University and a B.A. from Yale College.  From 2001 to 2007, Nat was an Assistant and then Associate Professor of Economics at the Yale School of Management, with a courtesy appointment at the School of Forestry and Environmental Studies.

     He has published articles on environmental economics in academic journals including the Journal of Public Economics, the RAND Journal of Economics, and the Harvard Environmental Law Review. Nat is also the author (with Sheila Olmstead) of Markets and the Environment (Island Press, 2007).