Профессор истории Нового времени Кембриджского университета, специалист по истории Европы и Германии XIX века. Основные работы: The Politics of Conversion. Missionary Protestantism and the Jews in Prussia 1728–1941 (1995); Kaiser Wilhelm II (2000); Iron Kingdom: The Rise and Downfall of Prussia, 1600–1947 (2006); Time and Power — Visions of History in German Politics, from the Thirty Years' War to the Third Reich (2018); Prisoners of Time: Prussians, Germans and Other Humans (2022); Revolutionary Spring: Fighting for a New World 1848–1849 (2023).