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Yphtach Lelkes

Assistant Professor, Annenberg School for Communication, University of Pennsylvania

Yphtach (Yph) Lelkes is an Assistant Professor at the Annenberg School for Communication.

His main focus is on the role of the political information environment in structuring attitudes, with a special interest in the proliferation of digital media. For instance, he has written on affective polarization, or the increasing hostility between Democrats and Republicans, and ways in which the media has contributed to interparty animosity. Another recent project examines ways in higher quality internet has changed citizen engagement, showing that citizens are learning more about politics, but not necessarily participating because of it. Additionally, he has written extensively on the structure of political ideology and identities. In his research, Lelkes relies on a variety of quantitative methods, including survey, field, and natural experiments, as well as administrative and geospatial data. 

Before joining the University of Pennsylvania, he was faculty at the Amsterdam School of Communication. He received his Ph.D. from Stanford University. His research has appeared or is forthcoming in various journals across disciplines, including the American Journal of Political SciencePNAS, the Journal of Politics, the Annual Review of Political Science, the British Journal of Political SciencePublic Opinion QuarterlyJournal of Experimental Political SciencePolitical Psychology, the Journal of Personality and Social Psychology, and the Journal of Experimental Social Psychology.