He is an expert on fascism in Europe and South America and several of his books have explored the links between the two. He has also been a commentator on politics in The Guardian and the New York Times, among other publications in Argentina and elsewhere.
- From Fascism to Populism in History (2017)
- The Ideological Origins of the Dirty War: Fascism, Populism, and Dictatorship in Twentieth-Century Argentina (2014)
- Transatlantic Fascism: Ideology, Violence and the Sacred in Argentina and Italy, 1919-1945 (2010)