Dr.Yanjie Bian is Professor of Sociology at Xi' an Jiaotong University,China,where he is the Dean of the School of Humanities and Social Science and the Director of the Institute for Empirical Social Science Research.Concurrently,he is Professor of Sociology at the University of Minnesota,the United States of America.His main areas of research include economic sociology,social stratification,social networks,and social survey methods.He has published 11 books and over 100 scholarly articles in English and Chinese combined.He is currently leading his research team to conduct China's national social science research foundation sponsored project on social network models in multidisciplinary perspectives.