All links to the replication files can be found under Publications, here you will find information on data that I have gathered or helped gathering. 
NCO add-on module (2019-2020)
Together with colleagues from Groningen (René Veenstra, Jan-Kornelis Dijkstra, and Maaike Engels) and Amsterdam (Sara Geven and Herman van de Werfhorst) I will collect data at primary schools in the Netherlands. This study, financed by the NRO, focuses on the transition from primary to secondary education. More specifically, we are interested in how friendship networks might affect educational decisions and inequality of educational opportunity. More information on this project can be found here.
Three generations database (2014)
Together with Matthijs Kalmijn I have created a survey that was a module in the LISS Panel in 2014. In this survey we have gathered detailed information on the educational, cultural and occupational resources of parents and grandparents, as well as the educational and occupational outcomes of grandchildren. Furthermore, we have information about the relationship between the grandparents and a grandchild, in order to test hypotheses about heterogeneity in the grandparent effect. The data are freely available for download here, once you have registered.
Educational systems database (2011)
The data on educational systems have been gathered by Herman van de Werfhorst and myself for different papers (see Publications). We update the data whenever necessary. The data we used for our 2013 publication in Comparative Education Review (“Educational Systems and the Trade-off Between Labor Market Allocation and Equality of Educational Opportunity”) was version 3. In the meantime we slightly adjusted the “tracking” variable. On this website, version 4 of the data on educational systems is available (last update November 2014). You can download the data as *.zip file here.