Craig Calhoun is University Professor of Social Sciences at Arizona State University, USA and former Director of the London School of Economics and President of the Social Science Research Council. Joseph Gerteis is Professor of Sociology and co-Director of the American Mosaic Project at the University of Minnesota, USA. His research focuses on race, ethnicity, and political culture. James Moody is Professor of Sociology at Duke University, USA, and Director of the Duke Network Analysis Center. His work focuses on the network foundations of social cohesion and diffusion. Steven Pfaff is Professor of Sociology at the University of Washington, USA. His research focuses on religion, politics and social change. Indermohan Virk is Executive Director of the Patten Foundation and the Poynter Center for the Study of Ethics and American Institutions at Indiana University Bloomington, USA.