| 1963 - 1970 |
Academic staff member (food microbiology) at the Department of Food Science, Wageningen Agricultural University |
| 1972 |
Doctorate. Thesis "Occurrence and properties of bacterial pectate lyases". Promotor Prof.Dr. W. Pilnik, professor of Food Science
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| 1970 - 1986 |
Academic staff member (food chemistry and food enzymology) at the Department of Food Science, Wageningen Agricultural University, The Netherlands
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| 1973 - 1974 |
Sabbatical at University of California, Davis, USA (studies on yeast cell wall lytic enzymes with Prof. H.J. Phaff)
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| 1982 - 1983 |
Sabbatical at INRA, Nantes (studies on pectins from sugar beet with Drs. C. Mercier and J.F. Thibault)
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| 1986 - 2002 |
Professor of food microbiology, Department of Agrotechnology and Nutritional Sciences, Wageningen University, The Netherlands. Theme of research: "ecology and physiology of food related microorganisms"
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| 1964 - 2002 |
Author or co-author of well over 300 papers, reviews and chapters in scientific and professional journals, books and congress proceedings |
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| 1986 - 2003 |
Promotor of 46 doctors and 7 doctoral candidates |
| 1986 - 2002 |
Member of the Board of Editors of "Science des Aliments", "Food Biochemistry" and "International Journal of Food Microbiology" journals |
| 1992 - 1998 |
Member of the Board of Deans of Wageningen University |
| 1994 - |
Member of the Health Council of The Netherlands |
| 1998 - 2000 |
Chairman of the Health Council's Committee on Foodborne infections in The Netherlands |
| 1996 - 2000 |
President of the Board of the Graduate Research School VLAG |
| 1999 |
Officer of the Order of Orange-Nassau (Royal Decoration) |
| 2002 |
Retired from Chair of Food Hygiene and Food Microbiology |
| 2002 |
Interim Director of Undergraduate School Technology and Nutrition |
| 2002 - |
Employee Winclove BIO-Industries B.V., Amsterdam |
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