| Date | Position |
|---|---|
| 1967-1969 | Chemical analyst, department serology, microbiology Westeinde hospital, La Haye, Netherlands |
| 1972-1977 | Chemical analyst immunology, temporal jobs as a student researcher/chemical analyst, Academic Hospital St. Radboud, Nijmegen, Netherlands |
| 1980 | Replacement medical director |
| 1980-1984 | Positions as a physician, pathologic departments of hospitals, Amsterdam, study pathology of kidney, Academic Hospital, Leiden |
| 1983-1988 | Positions as a physician, researcher, study, pathologic departments of hospitals, Villejuif, Paris, Brussels |
| 1988 | Replacement as a General Practitioner, Paris |
| 1990-1992 | Physician, medical assessment driving licenses, CBR, Rijswijk, Netherlands |
| 1992-1997 | Physician of Assurance medicine, assessment of illness reports offices General Administration Office (GAK), Netherlands |
| 1996-1998 | Physician of Assurance Medicine, assessment of longstanding illness reports, Law of Chronic or Definitive Inaptitude for Work (WAO), GUO, Gouda, Netherlands |
| 1998-1999 | Physician of Assurance Medicine, Cure Assessment, Cure Supply Netherlands (ZVN), Dordrecht, Netherlands |
| 1999-2012 | Physician of Occupational Health, Arboservices AGG, Commit, Arbo Unie, Arbo Ned, Meditel, AGW, Maetis(Ardyn), travelling to Rotterdam, Amsterdam, Leiden, Hoorn, in The Netherlands |
| 2009-2011 | Member of Management Committee, COST Action BM0601(Neuromath) Advanced Methods for the Estimation of Human Brain Activity and Connectivity, Brussels, Belgium |
| 2009-2011 | Member of Management Committee, COST Action BM0605(CATIA), Consciousness: A Transdisciplinary, Integrated Approached Brussels, Belgium |
| 2018 | Member of the Editorial Board, Journal of Stem Cell Research & Therapeutics Member of the Editorial Board, Journal of Neurosurgery Imaging and Techniques |