---

William G. Howell is the Sydney Stein Professor in American Politics in the Harris School and co-director of the Program on Political Institutions. He has written widely on separation-of-powers issues and American political institutions, especially the presidency. His recent research examines how domestic political institutions constrain the president's ability to exercise military force abroad. Howell is the co-author (with Jon Pevehouse) of While Dangers Gather: Congressional Checks on Presidential War Powers (Princeton University Press, 2007); author of Power without Persuasion: The Politics of Direct Presidential Action (Princeton University Press, 2003); co-author (with Paul Peterson) of The Education Gap: Vouchers and Urban Schools (Brookings Institution Press, 2002); and editor of Besieged: School Boards and the Future of Education Politics (Brookings Institution Press, 2005). His research also has appeared in numerous professional journals and edited volumes. Before coming to the Harris School, Howell taught in the government department at Harvard University and the political science department at the University of Wisconsin. In 2000, he received a Ph.D. in political science from Stanford University.