Mark Irving Lichbach is Professor and Chair of Government and Politics at the University of Maryland. A theorist interested in social choice and a comparativist interested in globalization, Lichbach explores the connections between collective action theories and political conflict as well as the connections between collective choice theories and democratic institutions. He is the author or editor of many books, including the award-winning The Rebel's Dilemma, and of numerous articles that have appeared in scholarly journals in political science, economics, and sociology. Alan S. Zuckerman is Professor of Political Science at Brown, University. Zuckerman's scholarship has focused on the analytical principles of comparative politics; the social context of political preferences, choice, and behavior; the individual and the state in established democracies; and the political structure of small groups. He is also the author, coauthor, editor, and co-editor of several books, including most recently Partisan Families: the Social Logic of Bounded Partisanship in Germany and Britain (2007) and The Social Logic of Politics: Personal Networks as Contexts for Political Behavior (2005). He has also published numerous articles in the leading journals of political science, as well as monographs in the United States, Britain, Italy, Germany, Austria, and Israel.