Sue Tierney is a Managing Principal at Analysis Group, an economic consulting firm headquartered in Boston. Residing now in Denver, she is an expert on energy and environmental policy and economics, specializing in the electricity and natural gas industry issues, and on policy issues related to carbon emissions from energy production, delivery and use. She previously served as Assistant Secretary for Policy at the U.S. Department of Energy and as Secretary of Environmental Affairs and public utility commissioner in Massachusetts. In addition to chairing the Board of ClimateWorks, she chairs the Board of Resources for the Future, and serves on the boards of the Barr Foundation, the Energy Foundation, the World Resources Institute, and the Keystone Center. Additionally, she serves on several energy- and climate-related committees at the National Academies of Sciences, Engineering and Medicine. She recently chaired the U.S. Department of Energy’s Electricity Advisory Committee and the External Advisory Council of the National Renewable Energy Lab (NREL). She has published widely, taught at the University of California at Irvine and at MIT, and received her Ph.D. from Cornell University.