Jeffrey D. Sachs is a professor and director of the Center for Sustainable Development at Columbia University, where he directed the Earth Institute from 2002 until 2016. He is also director of the United Nations Sustainable Development Solutions Network and a commissioner of the UN Broadband Commission for Development.He has been advisor to three United Nations secretaries general, and currently serves as a Sustainable Development Goal advocate undersecretary-general António Guterres. He spent more than 20 years as a professor at Harvard University, where he received his BA, MA and PhD degrees. His most recent book is A New Foreign Policy: Beyond American Exceptionalism (2018). Sachs was twice named in Time magazine’s 100 most influential world leaders, and was ranked by The Economist among the top three most influential living economists.