Craig Calhoun is University Professor of Social Sciences at Arizona State University and was previously Director of the London School of Economics and Political Science and President of the SSRC. His books include The Roots of Radicalism and Nations Matter. Dilip Parameshwar Gaonkar is Director of the Center for Transcultural Studies and Professor in Rhetoric and Public Culture at Northwestern University, where he also directs the Center for Global Culture and Communication. For many years he was editor of the influential journal Public Culture. Charles Taylor is Professor Emeritus in the Department of Philosophy at McGill University. Author of The Language Animal, Sources of the Self, The Ethics of Authenticity, and A Secular Age, he has received many honors, including the Templeton Prize, the Berggruen Prize, and membership in the Order of Canada.