Dr. Weihua An is Assistant Professor of Sociology and Quantitative Theory and Methods at Emory University. He is also a faculty member of the East Asian Studies Program and Department of Behavioral Sciences and Health Education at Emory. He received his Ph.D. in Sociology and a Master's degree in Statistics from Harvard. Drawing on unique experimental, textual, and survey data, his research advances methods for network analysis and causal analysis and uses them to answer important questions in economic sociology, medical sociology, and organizations. 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 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.