His research on American and European public opinion uses survey and experimental methods to understand how citizens’ political viewpoints reflect an interaction between the broader information environment –including the mass media and political elites – and individual-level attributes – namely citizens’ expressed behaviors, psychological traits, social identities, and motivations. His work has been published in the American Political Science Review, American Journal of Political Science, Public Opinion Quarterly, Political Psychology, and elsewhere. In addition, he has published more than 25 packages for the R statistical programming language and regularly writes about open science and reproducible research issues.