I am Director of Data Science at the Program for Opinion Research and Election Studies at the University of Pennsylvania. My research primarily focuses on the formation and realignment of political coalitions in the United States. I am particularly interested in understanding how structural economic change, political geography, and social arrangements influence political attitudes and behavior. In my methodological work, I develop methods to understand elections, to connect theory to statistics, and to improve measurement of public opinion using increasingly non-representative survey data.

At Penn, I teach classes on survey research methods and data science. I am also a senior elections analyst with the NBC News Decision Desk.

My research is published in the American Political Science Review, the Journal of Politics, Political Science Research and Methods, and Political Analysis. My work has been covered in the New York Times, the Washington Post, the Economist, and other news outlets.

Previously, I was a postdoctoral fellow at Princeton’s Center for the Study of Democratic Politics. I received my Ph.D. in political science from Stanford University and my undergraduate degree from the University of Pennsylvania.