Yphtach (Yph) Lelkes is an Associate Professor at the Annenberg School for Communication. He studies public opinion, political psychology, and political communication. His interests lie at the intersection of political communication, public opinion, and political psychology. In the broadest sense, he is interested in the antecedents, structure, and consequences of citizens’ political attitudes. He has focused on three, often overlapping, research questions: (1) What are the roots, structure, and consequences of affective polarization? (2) What is the impact of changes to the information environment on political attitudes? (3) What are the psychological underpinning and structure of political belief systems? His work appears in top field journals in Communication (Journal of Communication, Journal of Computer Mediated Communication), Political Science (American Journal of Political Science, Journal of Politics), Psychology (Journal of Personality and Social Psychology), as well as general interest journals (PNAS, Nature Human Behavior).