* 1982-1999: Director of MDPC: preventive health clinics.
* 1982-1999: Director of MDPC: preventive health clinics.
* 1999-2010: Director of VHD (Vital Health Diagnostics) and ARTC<br>(Autism Research and Treatment Center)
* 1999-2010: Director of VHD (Vital Health Diagnostics) and ARTC<br>(Autism Research and Treatment Center)
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* 1984-2010: Director of ELN (European Laboratory of Nutrients)<ref>http://www.europeanlaboratory.nl/</ref>.<br>Since 1995 including Vitamin Diagnostics, USA (President).
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* 1984-2010: '''Director of ELN (European Laboratory of Nutrients)'''<ref>http://www.europeanlaboratory.nl/</ref>.<br>Since 1995 including Vitamin Diagnostics, USA (President).
* 1988-2010: President of WHF (World Health Foundation).
* 1988-2010: President of WHF (World Health Foundation).
* 2002-2006: President Fonds voor het Hart (Foundation for the Heart)
* 2002-2006: President Fonds voor het Hart (Foundation for the Heart)