Martin Stuart ("Marty") Feldstein, currently George F. Baker Professor of Economics at Harvard University and President Emeritus of the National Bureau of Economic Research, Inc. (NBER), is an American economist who has made important contributions to public finance, macroeconomics, international economics, social insurance, health economics, the economics of national security, and many other fields of economics, trained a large number of prominent economists, served as President of the National Bureau of Economic Research for some thirty years, and served as President Ronald Reagan's chief economic advisor.