2005 – 2015: Professor of Sociology, Department of Sociology and Anthropology, University of Amsterdam.
2000 – 2005: Associate Professor, Department of Sociology and Anthropology, University of Amsterdam.
1994 – 2000: Senior researcher and program manager, Institute for Migration and Ethnic Studies, University of Amsterdam.
1990 – 1994: Post-doc researcher, Institute for Sociology of Law, Faculty of Law, Catholic University Nijmegen
1986 – 1991: Junior researcher, Department of Cultural Anthropology, Center for Study of Multi-Ethnic Society (SMES), Faculty of Social Sciences, University of Utrecht.
1982 – 1986: Research assistant, Center for the Study of Social Conflicts (COMT), Faculty of Social Sciences, University of Leiden.