David A. Cooper serves as Chair of the Department of National Security Affairs and holds a faculty appointment as The James V. Forrestal Professor of National Security Affairs. He teaches in the college's core and elective programs. His areas of expertise include nonproliferation, arms control and disarmament, weapons of mass destruction, multilateral negotiations and organizations, international relations theory, and U.S. foreign policy. He is a scholar-practitioner who served for almost two decades in the Office of the Secretary of Defense (OSD) where he held tenured career appointment in the Senior Executive Service (SES) including at the 2-star level.