Oliver Jean Blanchard
Olivier Jean Blanchard is currently the chief economist at the International Monetary Fund, a post he has held since September 1, 2008. He is also the Class of 1941 Professor of Economics at MIT, though he is currently on leave. Blanchard is one of the most cited economists in the world, according to IDEAS/RePEc
Blanchard has published numerous research papers in the field of macroeconomics, as well as undergraduate and graduate macroeconomics textbooks (including his extremely popular Macroeconomics).