Morton H. Halperin (born June 13, 1938) is a longtime expert on U.S. foreign policy, arms control, civil liberties, and the workings of bureaucracies. He was a senior advisor to the Open Society Foundations, which was founded by George Soros. He served in the Johnson, Nixon, Clinton, and Obama administrations. He has taught at Harvard University and as a visitor at other universities including Columbia, George Washington University, and Yale.