His research and teaching interests are European Union politics (in particular the institutions of the EU), political institutions, legislatures, social networks, political parties, and interest groups. His previous book, Who Decides, and How? Preferences, Uncertainty, and Policy Choice in the European Parliament, was published in 2010 by Oxford University Press. Other research has been published in the American Journal of Political Science, the British Journal of Political Science, European Union Politics, the European Journal of Political Research, and American Politics Research.