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Executive Director, Earth Institute, Columbia UniversityDr. Steven Cohen is the Executive Director of Columbia University’s Earth Institute and the Director of the Research Program on Sustainability Policy and Management at the Earth Institute. He is a Professor of Public Affairs at Columbia’s School of International and Public Affairs (SIPA), and the Director of the MPA in Environmental Science and Policy at SIPA. Cohen has over 30 years of experience in public management and environmental policy, including working as a former policy analyst and consultant to the US EPA. He is the author of numerous articles and books on including his most recent book, The Sustainable City (2017).