David Mayhew is Sterling Professor of Political Science Emeritus. He retired from Yale in 2015 but still teaches occasional courses. He specializes in U.S. legislative behavior, political parties, and policymaking. His books include Party Loyalty among Congressmen (1966); Congress: The Electoral Connection (1974 & 2004); Placing Parties in American Politics (1986); Divided We Govern (1991 & 2005); America’s Congress (2000); Electoral Realignments (2002); Parties and Policies (2008); Partisan Balance (2011); and The Imprint of Congress (2017). Aside from Yale, where he began teaching in 1968, he has taught at UMass/Amherst, Amherst College, Oxford, and Harvard, and has held fellowships at Stanford and CalTech. He is a fellow of the American Academy of Arts and Sciences, the American Philosophical Society, and the National Academy of Sciences.