He is Professor of Sociology at the Faculty of Political Sciences of the Complutense University of Madrid. He is the author of Born to Lose. A sociological analysis of school rejection and dropout (CIDE, 1990), Contemporary social structure. Social classes in industrialized countries (Siglo XXI, 1995), Social classes and political behavior in Spain (Entinema, 1998), The challenges of compulsory education (Ariel, 2000), A quality education for all. Educational reform and counter-reform in current Spain (Siglo XXI, 2002), Another school is possible (Siglo XXI, 2006), Building democratic schools (compiler together with JI López, Hipatia, 2008), The challenges of school participation (Morata, 2011) and numerous articles in specialized and general magazines. He was a collaborator of the Movement for the Quality of Education in the South and East of Madrid, a member of the executive of the Federation of Fathers and Mothers of Madrid (Francisco Giner de los Ríos) and president of the Association for the Sociology of Education.