Lai Wei is a PhD candidate in the Department of Sociology, Princeton University. Before coming to Princeton, he attained BA in sociology from Tsinghua University. Lai’s research interests include social mobility, public opinion, quantitative methodology, and China. One strand of his ongoing research tries to develop new indicators of social mobility and new methods for studying the impact of mobility that borrow insights from machine learning and causal inference. Another continuing line of research of his investigates the landscape, origin, and consequence of public opinion in China using survey, experimental, and online data. Lai is broadly interested in how to use machine learning to help social science research.