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I specialize in the history of American foreign relations. More specifically, my teaching and research interests lie in the intersections between the national and the international, the foreign and the domestic, including the influence that domestic politics and culture—particularly religion—have had on the conduct of U.S. foreign policy.

I am currently working on three major projects: I am writing a book on the idea of “national security” in American history, which will be published by Harvard University Press; co-editing (with Lien-Hang Nguyen) Vol. 2 of the forthcoming 3-volume Cambridge History of the Vietnam War; and co-editing (with Brooke Blower) Vol. 3 of the forthcoming 4-volume Cambridge History of America and the World.