Luca G. Castellin is an Assistant Professor at the Department of Political Science, Università Cattolica del Sacro Cuore (Milan, Italy). His most recent publications include Ascesa e declino delle civiltà. La teoria delle macro-trasformazioni politiche di Arnold J. Toynbee (2010) and Il realista delle distanze. Reinhold Niebuhr e la politica internazionale (2014). His research focuses on History of International Thought and International Relations.