Jeffrey D. Sachs is University Professor and Director of the Center for Sustainable Development at Columbia University. He is President of the UN Sustainable Development Solutions Network, Co-Chair of the Council of Engineers for the Energy Transition, and Commissioner of the UN Broadband Commission for Development. He has been Special Advisor to three United Nations Secretaries-General, and currently serves as an SDG Advocate under Secretary General António Guterres. He spent over twenty years as a professor at Harvard University, where he received his B.A., M.A., and Ph.D. degrees