David Lewis is William R. Kenan, Jr. Professor and Chair of the Department of Political Science at Vanderbilt University. He currently serves as co-director of the Center for the Study of Democratic Institutions at Vanderbilt. His research interests include the presidency, executive branch politics and public administration. He is the author of two books and numerous articles and book chapters on American politics, public administration and management. His first book Presidents and the Politics of Agency Design (Stanford University Press, 2003) examines why elected officials design agencies to be insulated from political influence. His second book, The Politics of Presidential Appointments: Political Control and Bureaucratic Performance (Princeton University Press, 2008), analyzes the causes and consequences of presidential politicization of the executive branch. Before joining Vanderbilt’s Department of Political Science, he was assistant professor of politics and public affairs at Princeton University, where he was affiliated with the Center for the Study of Democratic Politics, from 2002-08. He began his academic career at the College of William and Mary, where he was an assistant professor in the Department of Government from 2000-02. PhD. Stanford University.