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Jobs:
- Sport instructor Dutch Army (1958-1959)
- Teacher of physical education in primary and secondary schools (1963-1973)
- Lecturer Pedagogics and Didactics of physical education for young children in Teacher College (1966-1971)
- Assistent professor Faculty of Human Movement Sciences, Department of Educational Sciences, Free University Amsterdam (1973-1985)
- Ibidem Associate professor (1986-1997)
- Professor in Human Movement Sciences, Faculty of Social Sciences, Department of Educational Sciences, Utrecht University (1991-1997)
- Professor in Special Education, Faculty of Social Sciences, Department of Educational Sciences, Utrecht University (from 1997-2001), since 2001 professor-emeritus.
- Guest Professor European Masters Degree in Adapted Physical Activity, Faculty of Physical Education and Physiotherapy, Katholic University Leuven, Belgium (from 1991)
- Visiting Professor, Faculty of Physical Education and Health Sciences, University of Jyväskylä, Jyväskylä, Finland (1993)
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