He has previously been an Assistant Professor at Rutgers University, and held visiting appointments at Princeton, Yale, and IUPERJ (currently IESP). He specializes in Latin American politics, and has written on executive-legislative relations, political parties, electoral politics, social policy, voting behaviour, and on the measurement and meaning of ideology. He is currently working on a second book project co-authored with Daniela Campello (FGV/EBAPE) on economic voting and democratic accountability in Latin America.