Dr. Weihua An is Assistant Professor of Sociology and Quantitative Theory and Methods and a faculty member of the East Asian Studies Program at Emory University. He received his Ph.D. in Sociology and a Master's degree in Statistics from Harvard University. His research focuses on network analysis and causal inference with applications to studying inequality and social policy, medical sociology, and sociology of 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 inference, he studies matching and propensity score methods, instrumental variable methods, and causal inference under interference. His research also connects the two areas by examining causality in networks and employing networks to improve causal inference. 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.