Manfred te Grotenhuis (PhD in Sociology, Radboud University Nijmegen, The Netherlands) is a professor of Quantitative Data Analysis and an affiliate of the Interuniversity Center for Social Science Theory and Methodology (ICS). Statistical contributions include articles in American Journal of Sociology , American Sociological Review , Journal for the Scientific Study of Religion , and International Journal of Epidemiology . He has been teaching statistics to students from the Faculty of Social Sciences at Radboud University Nijmegen since 1995 and has written several introductory books on SPSS and statistics. He is the recipient of his university's biennial teaching award and loves/hates to ride a 20 mile cycling time trial.
Chris Visscher (M.Sc. in Sociology, Radboud University Nijmegen, The Netherlands)nbsp;has beennbsp;a principal lecturer on Statistics for more than 30 years. He wrotenbsp;one of thenbsp;early SPSS syntax manuals for students in 1986. He loves to sing Gregorian chant, in his office, in churches, and occasionally at studentsï¿½ house parties around 3 am. nbsp;nbsp;nbsp;nbsp;