Douglas William Elmendorf is an American economist and academic who served as Director of the Congressional Budget Office (CBO) from 2009 to 2015. He testified during IRS hearings while in that role. Following his CBO tenure, he served as Dean of the John F. Kennedy School of Government at Harvard University from 2016 to 2024, and currently holds the titles of Distinguished Service Professor and Lucius N. Littauer Professor of Public Policy at Harvard. His career also includes positions as a Senior Fellow at the Brookings Institution (2007-2009; 2015), Director of The Hamilton Project at Brookings, economist at the Federal Reserve Board, and senior staff economist at the President's Council of Economic Advisers.