I am Professor, Department Vice-Chair, and Director of Graduate Studies in 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, American elections, American political development, and state politics.

I have authored and coauthored a number of books and articles in scholarly journals. 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. I am a regular contributor to Mischiefs of Faction, a blog about political parties.