I am the Leroy B. Williams Professor of History and Political Science, in the Department of Government at Harvard University. I am also a Research Associate at the National Bureau of Economic Research, and a Fellow of the American Academy of Arts and Sciences. I taught for six years in the Department of Economics at the University of Chicago, and for eighteen years in the Departments of Political Science and Economics at the Massachusetts Institute of Technology.
My primary research and teaching interests are in American politics, with a focus on representation. I have written on elections, campaign finance, legislative behavior and institutions, interest groups, direct democracy, the media, and corruption. My articles have appeared in the American Political Science Review, the American Journal of Political Science, the Journal of Politics, the American Economic Review, the Journal of Political Economy, Econometrica, the Quarterly Journal of Economics, and other journals. I am co-author of The End of Inequality: One Person, One Vote and the Transformation of American Politics and Primary Elections in the United States.