KAREN S. COOK is Ray Lyman Wilbur Professor of Sociology and the current chair of the sociology department at Stanford University. CHRIS SNIJDERS is professor at the Eindhoven University of Technology. VINCENT BUSKENS is associate professor in the Department of Sociology/ICS at Utrecht University. COYE CHESHIRE is assistant professor at the School of Information at the University of California, Berkeley. CONTRIBUTORS: Vincent Buskens, Coye Cheshire, Karen S. Cook, Chris Snijders, Judd Antin, Brandy Aven, Davide Barrera, Gary E. Bolton, Andreas Diekmann, Alexandra Gerbasi, Ben Jann, Tapan Khopkar, Azi Lev-On, Masafumi Matsuda, Uwe Matzat, Axel Ockenfels, Paul Resnick, Hiroyuki Takahashi, Yukihiro Usui, Sonja Utz, Jeroen Weesie, David Wyder, Toshio Yamagishi, and Noriaki Yoshikai.