Marcel Zwietering studied Biotechnology at Wageningen University and after his PhD in 1993 worked in the Food Process Engineering group as assistant and associate professor. From 1998-2002 he worked for the research lab of Danone in France. Since January 2003 he is professor in Food Microbiology at Wageningen University. Within this chair research subjects in the domain of food safety management, risk analysis, fermentation, detection and hygiene, eco-physiology and functional genomics are investigated. Marcel is editor of the International Journal of Food Microbiology and member of the International Commission on Microbiological Specifications for Foods (ICMSF).