Martin Stuart Feldstein was an American economist. He was the George F. Baker Professor of Economics at Harvard University and the president emeritus of the National Bureau of Economic Research (NBER). He served as president and chief executive officer of the NBER from 1978 to 2008. From 1982 to 1984, Feldstein served as chairman of the Council of Economic Advisers and as chief economic advisor to President Ronald Reagan. Feldstein was also a member of the Washington-based financial advisory body the Group of Thirty from 2003.

The National Bureau of Economic Research (NBER) is an American private nonprofit research organization "committed to undertaking and disseminating unbiased economic research among public policymakers, business professionals, and the academic community." The NBER is known for proposing start and end dates for recessions in the United States.