In 1979 I did a teacher training in Mathematics and Economics at the Ubbo Emmius Institute for Secondary Teacher Training in Groningen. In 1985 I enrolled as a Mathematics student at the University of Groningen with Statistics as his main subject. I got mine Masters Degree in 1988 with the Master's thesis ' Does Telepathy exist? Data of Heymans et al. reanalyzed'. After that I was appointed as research assistant (AIO) to the research project titled 'Item bias detection using the loglinear Rasch model with latent classes' at the Faculty of Educational Sciences and Technology of the University of Twente. This research was done under the auspices of the Interuniversity Graduate School of Psychometrics and Sociometrics and has been finished in 1993 with the dissertation titled 'The solution-error response-error model: A method for the examination of test item bias'. Since 1992 I have been working as a biostatistician and methodologist at the Center for Biostatistics at the University of Utrecht. Since July, 1st 2008 I am appointed as assistant professor at the Julius Center of the University Medical Center Utrecht I am a registered biostatistician (Netherlands Society for Statistics and Operations Research).

I have two major regions of activities: statistical education and statistical consultancy to researchers and students. The most statistical courses in which I am involved are for the Biology department and Pharmaceutical Sciences department of the Utrecht University. Every year I am also involved in the introductory biostatistics course for researchers. I advice students and researchers from as well the University Medical Center Utrecht (UMCU) as the Utrecht University (UU) on the statistical aspects of the design and statistical analysis of their (scientific) research. The range of consultancy problems can be very divers, but I am quite familiar with multilevel analysis, structural equation models, questionnaires, multivariate analyses (i.e. factor analysis, cluster analysis) and IRT theory.