Gilbert (Gib) Metcalf's research focuses on policy evaluation and design in the areas of taxation, energy, and climate change. During 2011 and 2012, Metcalf served as the Deputy Assistant Secretary for Environment and Energy at the U.S. Department of Treasury. In that position he led the U.S. oversight of multilateral environmental finance mechanisms and served as the first U.S. Board member for the Green Climate Fund, a multilateral climate finance fund established at the UNFCCC climate change negotiations in Durban South Africa (COP-17). Metcalf has frequently testified before Congress and served on expert panels, including a 2010 National Academies of Sciences panel measuring the social cost of energy production and consumption. He holds a PhD in economics from Harvard University, a Masters degree in agricultural and resource economics from the University of Massachusetts, and a BA in mathematics from Amherst College.