Grant serves as the Deputy Director for Strategic Stability in the Joint Staff J-5 (Strategy, Plans, and Policy). On the Joint Staff, he is responsible for strategy, plans, and policy related to arms control, artificial intelligence and autonomy, countering weapons of mass destruction, nuclear deterrence, national security space, missile defense, operations in the information environment, and subsea and seabed warfare. From 2023 to 2025, he was the Vice Deputy Director for Strategic Stability in the JS J-5.
Earlier in his career, he served on the National Security Council Staff as a director for AUKUS where he supported the development of the optimal pathway to provide Australia with a nuclear-powered submarine capability and trilateral collaboration to enhance advanced defense capabilities. During his time on the NSC staff, he also served as director for legislative affairs, covering defense, export control, and arms control issues. Before that, Grant served on the House Armed Services Committee professional staff where he led oversight strategic deterrence and nuclear issues.
Earlier in his career, Grant worked at the U.S. Department of Homeland Security’s Cybersecurity and Infrastructure Security Agency and the Department of State on a range of weapons of mass destruction and cybersecurity issues.