John Breuilly is Emeritus Professor of Nationalism and Ethnicity at the London School of Economics and Political Science. His publications include Nationalism and the State (2nd ed., 1993), Austria, Prussia and the Making of Modern Germany, 1806-1871 (2011), and ‘On the principle of nationality’, in The Cambridge History of 19th Century Political Thought, edited by Gareth Stedman Jones & Gregory Claeys (2011). He also edited The Oxford Handbook of the History of Nationalism (2013). His principal interests are in the history, politics and ideologies of nationalism and in 19th century German and European history. He is currently writing a global history of nationalism.