Education
De Graaf received his Doctor of Philosophy from Utrecht University (1988) and was a post-doctoral researcher at the Max Planck Institute for Education and Human Development in Berlin (1988-1989).
De Graaf received his Doctor of Philosophy from Utrecht University (1988) and was a post-doctoral researcher at the Max Planck Institute for Education and Human Development in Berlin (1988-1989).
He was a research fellow at the Royal Netherlands Academy (1990-1995) and professor in Sociology at Nijmegen University (2001-2007).