Dr. Weihua An is Associate Professor of Sociology and Quantitative Theory and Methods and a faculty member of the East Asian Studies Program and Department of Behavioral Sciences and Health Education at Emory University. He received his Ph.D. in Sociology and a Master's degree in Statistics from Harvard University. His research advances methods for network analysis and causal analysis with applications in economic sociology, medical sociology, and organizational sociology. He is a recipient of the Clifford Clogg Award from the American Sociological Association for his research in methodology and the Faculty Teaching Award from the Department of Sociology, Emory University. In network analysis, he studies social networks as a medium for social influence, a platform for social prediction, an object of social perception, and a mechanism for social inequality. In causal analysis, he studies matching and propensity score methods, instrumental variable methods, and causal inference under interference. His work has appeared in Social Forces, Social Science Research, Sociological Methodology, Sociological Methods and Research, Social Networks, Network Science, Journal of Statistical Software, The American Statistician, etc. He is also an author of several statistical software, including "LARF" for instrumental variable estimations of causal effects through local average response functions and "keyplayer" for locating key players in social networks. He serves on the editorial boards of American Sociological Review, Social Science Research, and Sociological Methods and Research. He is currently editing a special issue on "New Quantitative Approaches to Studying Social Inequality" for Sociological Methods and Research and co-editing a special issue on "Social Networks and Social Psychology" for Social Psychology Quarterly.