He studies comparative political behavior and representation. Lupu’s book, Party Brands in Crisis (Cambridge University Press, 2016), explores how diluting party brands eroded partisan attachments in Latin America and facilitated the collapse of established parties. His research has also appeared in American Journal of Political Science, American Political Science Review, Comparative Political Studies, Journal of Politics, and World Politics, among other outlets. Lupu holds a PhD from Princeton University. He served as an Americas adviser for Freedom in the World.