Daniel C. Esty is Hillhouse Professor of Environmental Law and Policy at Yale University with appointments in the Environmental and Law Schools. He is also a former top official with the U.S. Environmental Protection Agency and has advised companies across the world on corporate environmental strategy. Andrew S. Winston is director of the Corporate Environmental Strategy Project at Yale's Environment School. He has advised companies on corporate strategy while at Boston Consulting Group and has held management positions in strategy and marketing at such leading media companies as Time Warner and Viacom.