Jeffrey D. Sachs is an American economist and former director of The Earth Institute at Columbia University, where he holds the title of University Professor, the highest rank Columbia bestows on its faculty. He is known as one of the world's leading experts on economic development and the fight against poverty.He is special adviser to the former United Nations Secretary-GeneralBan Ki-Moon on the Millennium Development Goals, having held the same position under former UN Secretary-General Kofi Annan. He is co-founder and chief strategist of Millennium Promise Alliance, a nonprofit organization dedicated to ending extreme poverty and hunger. From 2002 to 2006, he was director of the United Nations Millennium Project's work on the Millennium Development Goals, eight internationally sanctioned objectives to reduce extreme poverty, hunger, and disease by the year 2015. His books include The End of Poverty,Common Wealth, and his most recentBuilding the New American Economy.