Professor of the University Program of Development Studies, UNAM. Doctor in Sociology (PhD., 2000), teacher in Sociology (1996) and in Statistics (1994) all by the State University of Iowa, degree in Mathematics (UNAM, 1982). Researcher in the USA (2001-2008) in different institutions: at the Mayo Clinic in Rochester, Minnesota, at the University of Pennsylvania, and at the Arizona State University. His research interests are inequality and poverty, the development of advanced quantitative methodologies for social research. He is currently a full professor at the UNAM. He has published more than 50 articles in various national and international refereed academic journals and is co-author of two books. He has taught courses on structural modeling, longitudinal analysis, and the elaboration of surveys in different Mexican institutions such as El Colegio de México, Instituto Tecnológico Autónomo de México, Banco de México, Universidad Anáhuac del Sur. He is a national researcher; currently has S.N.I. level II.