Dr. Nagel studies democratic theory, voting systems, social choice, and political participation. He has explored those themes with empirical research on the United States, New Zealand, and Britain. He is author of The Descriptive Analysis of Power, Participation, and many papers, including articles in the American Political Science Review, British Journal of Political Science, Journal of Politics, World Politics, American Politics Quarterly, Public Choice, Journal of Policy Analysis and Management, Political Science, and elsewhere. Nagel has been a Visiting Professor at the University of Essex, a Fulbright Scholar at the University of Canterbury in New Zealand, an NSF grantee, and an IRIS Scholar. He serves on the editorial boards of the British Journal of Political Science and Political Science. At Penn, he has served in several administrative roles, including Chair of the Political Science Department in 2000-03, Associate Dean for Graduate Studies in 2004-08, and Associate Dean for the Social Sciences in 2009-11. Since retiring in 2012, he has been active in the Penn Association of Senior and Emeritus Faculty and served as its President in 2014-15.