I am a professor and chair of the Department of Politics at Catholic University and an associate fellow at the Institute for Policy Research. My research and teaching interests include the U.S. Congress, political leadership, state (legislative) politics, American elections, and American political development.

My most recent book, Legislative Hardball (Cambridge University Press, 2019), is the first book-length examination of the tactics and effectiveness of the House Freedom Caucus. I am also the coauthor of Choosing the Leader with Douglas Harris (Yale University Press, 2019), which explains the vote choice of lawmakers in congressional leadership elections, and I am a contributing writer to Mischiefs of Faction, a blog about political parties.