Derek H. Chollet

Derek Chollet is an American foreign policy advisor and author serving as chief of staff to the United States Secretary of Defense. He served as the counselor of the United States Department of State from 2021 to 2024. Previously, Chollet was the executive vice president for security and defense policy at the German Marshall Fund of the United States. From 2012 to 2015, Chollet was Assistant Secretary of Defense for International Security Affairs, where he managed U.S. defense policy involving Europe, NATO, the Middle East, Africa, and the Western Hemisphere for Secretaries of Defense Leon Panetta and Chuck Hagel.