I am Professor of Sociology, Johns Hopkins University. My areas of interest are social inequality, migration, family and public policy, sociology of education, and quantitative and computational methods. My research tests hypotheses developed from sociological theories using advanced methodology and national longitudinal survey data. I received a Bachelor's in English at South China Normal University and a Master's in Sociology at Sun Yat-sen University, both in China, and a PhD in Sociology in 1990 from the University of Chicago. I was a postdoc fellow at RAND's Labor and Population Program, and Assistant and Associate Professor at the Department of Sociology, University of Iowa. I have been in the Sociology Department at Hopkins since 1996.