Benjamin is Professor of Modern History at the University of Sheffield. His main fields of research are peace history, the history of war and violence in the twentieth century and the theory of history.
His many publications have covered various aspects of German and European history since the end of the nineteenth century. His book on War Experiences in Rural Germany 1914-1923 (Oxford: Berg, 2007) is considered to be a seminal study on the First World War. Benjamin serves on the editorial board of the journal Peace & Change.