He has a MSc degree in Biochemistry from the University in Leyden and finished his Ph.D. thesis 'Occupational Hazards and Solutions' in 1996. From 1980 onwards he is working at the Safety Science Group and engaged in research concerning exposure and control measures to occupational hazards, on asbestos, on post academic courses on safety, health and environment, on occupational accidents and its legal aspects in various branches of industry, including the steel industry, rubber industry, chemical industry, transport branch, building branch and the asbestos industry. Regularly he is publishing on these topics. In the period 1981-2011, 48 international, and 65 Dutch scientific papers appeared with him as author of as co-author.