Jeffrey D SachsJeffrey D. Sachs is university professor and director of the Center for Sustainable Development at Columbia University. He is also director of the United Nations Sustainable Development Solutions Network and has been advisor to three UN secretaries-gneral. He is a New York Times bestselling author, and his books include The Age of Sustainable Development, Building the New American Economy, and A New Foreign Policy: Beyond American Exceptionalism. Read More Read Less