Dr. Weihua An is Assistant Professor of Sociology and Quantitative Theory and Methods at Emory University. His main research areas are network analysis and causal inference. In network analysis, he studies theories and applications that treat social networks as medium for social influence and platforms for social surveillance. In causal inference, he studies matching and propensity score methods, instrumental variable methods, and causal inference with treatment diffusion. His research also connects the two areas by examining causality in networks and employing networks to improve causal inference. His work contributes to studies on health and social policy, organizations, and development and has appeared in Social Forces, Social Science Research, Sociological Methodology, Sociological Methods and Research, Social Networks, Network Science, The American Statistician, Journal of Statistical Software, and The R Journal. He is also an author of several software, including "LARF" for causal inference via local average response functions and "keyplayer" for locating key players in networks. He serves on the editorial boards of American Sociological Review and Sociological Methods and Research.