I am a Professor of Political Science at Washington University in St Louis. My research interests are located in American politics and political methodology with an emphasis on individual political behavior. I focus on the social foundations of participatory democracy — the ways in which social networks influence voting, donating, choosing a candidate or identifying with a particular party. My other interests are broadly defined as those involving voting and elections and range from evaluating the consequences of different voting technologies to developing techniques to draw causal inferences from social network data.