Professor Theriault is fascinated by congressional decision-making. He has published six books: Disruption? The Senate during the Trump Era (ed, Oxford University Press, 2024), Congress: The First Branch (with Mickey Edwards; Oxford University Press, 2020), The Great Broadening (with Bryan Jones and Michelle Whyman; University of Chicago Press, 2019), The Gingrich Senators (Oxford University Press, 2013), Party Polarization in Congress (Cambridge University Press, 2008), and The Power of the People (Ohio State University Press, 2005). He has also published numerous articles in a variety of journals on subjects ranging from presidential rhetoric to earmarks and the Louisiana Purchase to the Pendleton Act of 1883.