Gilbert E. Metcalf is the John DiBiaggio Professor of Citizenship and Public Service and a Professor of Economics at Tufts University. In addition, he is a Research Associate at the National Bureau of Economic Research and a University Fellow at Resources For The Future. Metcalf is an internationally recognized expert on energy and environmental taxation and has written extensively on climate policy and carbon pricing. He has frequently testified before Congress and consulted to the U.S. EPA, the Department of Energy, and various other organizations. During 2011 and 2012, he served as the Deputy Assistant Secretary for Environment and Energy at the U.S. Department of Treasury where he was the founding U.S. Board Member for the UN based Green Climate Fund.