Kai Maaz, Dr., studied Social Pedagogy at the Catholic University of Applied Sciences, Berlin (Dipl.-Soz.-P&auml;d. (FH), 1998) and Social Science at the Humboldt University, Berlin (Dipl.-Soz.-Wiss., 2002). He received his Ph.D. from the Free University of Berlin in 2006 for his work on social background and entry to higher education. From October 2010 to September 2013, he held the chair for &lsquo;Quantitative Methods in the Educational Sciences&rsquo; at the University of Potsdam, since October 2013 he is head of the department &lsquo;Steering and Financing&rsquo; at the German Institute for International Educational Research (DIPF) in Berlin. He is currently involved in the project on Transition from Primary to Secondary School: Regional, Social, and Ethnic/Cultural Disparities in Educational Equity (TRANSITION), and in two large-scale longitudinal studies, the study on Learning Processes, Educational Careers, and Psychosocial Development in Adolescence and Young Adulthood (BIJU) and the project on Transformation of the Secondary School System and Academic Careers (TOSCA). His main research interests include the effects of social background (primary and secondary social disparities) on educational and vocational opportunities and educational decision-making processes.