Yu Xie is Bert G. Kerstetter ’66 University Professor of Sociology and has a faculty appointment at the Princeton Institute of International and Regional Studies, Princeton University. He is also a Visiting Chair Professor of the Center for Social Research, Peking University. His main areas of interest are social stratification, demography, statistical methods, Chinese studies, and sociology of science. His recently published works include: Marriage and Cohabitation (University of Chicago Press 2007) with Arland Thornton and William Axinn, Statistical Methods for Categorical Data Analysis with Daniel Powers (Emerald 2008, second edition), and Is American Science in Decline? (Harvard University Press, 2012) with Alexandra Killewald. He is a member of the American Academy of Arts and Sciences, Academia Sinica and the National Academy of Sciences.