Zhong Zhao is Professor of Economics at Renmin University of China and a Research Fellow of the Institute for the Study of Labor (IZA). His main areas of interest are labor economics, applied microeconometrics, social program evaluation and economy of China. His recent research topics on China include children's health, earnings instability and inequality, rural-urban disparity, comparison of wage evolutions in India and China, and rural-urban migration.

Petra E. Todd is the Alfred L. Cass Term Professor in Economics at the University of Pennsylvania. She is a fellow of the Econometric Society and a research associate of the National Bureau for Economic Research, IZA, and of the Population Studies Center at the University of Pennsylvania. Her main fields of research are labor economics, development economics, and microeconometrics.

V. Joseph Hotz is the Arts and Sciences Professor of Economics at Duke University and a research associate of the Duke Population Research Institute. He specializes in the areas of labor economics, economics of the family, economic demography, applied econometrics, and evaluating the impact of social programs. For his contributions to his field, Professor Hotz has appeared on the list of Who's Who in America since 1993. He was also named a Fellow of the Econometric Society in 2003.