He holds a Ph.D. from Rutgers University. At Georgian Court, he teaches courses on modern American history, peace history, and nonviolent social movements. He has published and spoken widely on peace history, radical pacifism, nonviolent social movements, and World War II conscientious objectors. He has written Radical Pacifism: The War Resisters League and Gandhian Nonviolence in America, 1915–1923 (Syracuse, N.Y.: Syracuse Studies on Peace and Conflict Resolution [Syracuse University Press], 2003) and edited Army GI, Pacifist CO: The World War II Letters of Frank and Albert Dietrich (New York: Fordham University Press, 2005). He is completing a book manuscript on the lives and World War II prison letters of radical pacifist siblings Igal and Vivien Roodenko. He is president of the Peace History Society.