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Samuel A. Stouffer Professor of Political Science and Communication; Director, Institute for the Study of Citizens and Politics, Annenberg Public Policy Center. Senior Fellow in Governance Studies, Brookings Institution. Research established the influence of collective opinion on individual opinions and demonstrated through field studies and controlled laboratory experiments, tensions between deliberative and participatory conceptions of democracy. Co-founder and principal investigator of Time-sharing Experiments in the Social Sciences (TESS), which provides opportunities for original research across the social sciences. Books include In Your Face Politics, The Obama Effect: How the 2008 Campaign Changed White Racial Attitudes (with Seth K. Goldman), Population-Based Survey Experiments, Hearing the Other Side: Deliberative Versus Participatory Democracy, and Impersonal Influence: How Perceptions of Mass Collectives Affect Political Attitudes. Recipient of the Lifetime Career Achievement Award in Political Communication from the American Political Science Association.