(Ph.D., University of Arkansas, 2006): Modern Middle East; History of Islam, British and French Imperialism; United States Diplomatic History; Medieval Middle East; Modern Britain; Modern United States

(Ph.D., University of Connecticut, 1993): Colonial American History, Puritanism, American Revolution

(Ph.D., Ohio State University, 1971): Early Modern Europe, European Diplomacy

(Ph.D., Princeton University, 1995): Chinese and Japanese History; Military History

(Ph.D., Emory University, 1973): Institutional, Legal, and Social History of Early Modern France and the Cultural History of US Cemeteries

(Ph.D., University of Virginia, 2006): American Political Development; Economic History of the United States; history of demographic policy and ideas

(Ph.D., Stony Brook University, 2001): History of Technology, Mass Media, and U.S. Foreign Relations (esp. American-East Asian Relations)

(Ph.D., University of Iowa, 1963): History of Modern Christianity from the Reformation to the Present; History of Religion and Politics in Europe, Australia and the United States

(Ph.D., Northwestern University, 1998): American Agriculture, Environmental and Native American

(Ph.D., University of Illinois at Urbana-Champaign, 2001): Germany since 1750; European Cultural & Intellectual; Modern Middle East

(Ph.D., Stony Brook University, 2002): Colonial and Modern Mexico; Peasant and Indigenous Studies; History of Public Health, Medicine and Disease, and Environmental History

(Ph.D., University of California, Berkeley, 1971): Medieval History, Church History, Hagiography

(Ph.D., University of Cincinnati, 2005): French Empire in America; Mississippi Valley History; Environmental History

(Ph.D., Rutgers University, 1972): American Military History with particular interests in the twentieth century, civil-military relations, the interplay between societal development and military institutions, American notions about the nature of war, and aspects of American military aviation; American Cultural History and, as an element of that, the History of Sport with special interest in the emergence of mass popular culture

(Ph.D, Yale University, 2009): Modern and Contemporary China, Japan, the History of Imperialism, and World History

(Ph.D., Ohio State University, 1987): Military History, U.S. Military History, Japanese History

(Ph.D., Queen's University at Kingston, 1997): Military History, 19th and 20th Century Britain, 19th and 20th Century European Diplomacy

(Ph.D., Kansas State University, 2001): 19th century United States history, specifically 19th century U.S. political and military history and the Civil War

(Ph.D., University of Colorado, 1987): Environmental, Kansas, and U.S. Western History

(Ph.D., Yale University, 1997): Russia and the Soviet Union, military history, South Asia

(Ph.D., University of Florida, 1991): United States Constitutional and Legal History, American South, 19th Century U.S., Civil War and Reconstruction

(Ph.D., University of Kansas, 1984): The Progressive Era and Twentieth Century America, particularly History of American Women, History of American Medicine, History of American Higher Education, History of Professionalization, History of Social Science