Mallory Stewart

Mallory Stewart is the Executive Vice President at the Council for Strategic Risks and a Senior Non-Resident Fellow at the Belfer Center of Harvard’s Kennedy School. She was the Assistant Secretary for the Bureau of Arms Control, Deterrence, and Stability (ADS) at the U.S. Department of State from April 2022 until January 2025. At the end of her service as Assistant Secretary, Ms. Stewart received the State Department’s Distinguished Honor award and medal for her outstanding leadership. She joined the bureau after serving as a Special Assistant to President Biden and Senior Director for Arms Control, Disarmament, and Nonproliferation at the National Security Council from 2021 until April 2022. Prior to joining the NSC, Ms. Stewart was the Senior Manager for Global Nuclear Security and Nonproliferation at the Center for Global Security and Cooperation in Sandia National Laboratories. While at Sandia, she led Sandia’s Cooperative Monitoring Center in its efforts to facilitate scientific engagement for global security. From 2015 to 2017, Ms. Stewart was Deputy Assistant Secretary of State for Emerging Security Challenges and Defense Policy in what was then called the Bureau of Arms Control, Verification and Compliance. In that role, she oversaw the Office of Emerging Security Challenges and the Office of Chemical and Biological Weapons Affairs.  Ms. Stewart has also worked as an Adjunct Assistant Professor at Georgetown University’s School of Foreign Service, and as an associate at the law firm of Sullivan & Cromwell. She holds an A.B. from Harvard College and a J.D. from Stanford Law School.