I teach and do research in operations research and probability at the Faculty of Economics and Business, University of Groningen.
Teaching
Data Analytics and Machine Learning: lecture notes, per chapter and as one PDF.
Writing
My blog contains notes on probability, optimization and programming. The books page collects my own books and notes, and technical books I like.
Walking tracks
- Wandelvogel: plan walks in the Netherlands using OpenStreetMap and export routes as GPX.
- Groningen walks: explore buildings in the city, sorted by year of construction.
- The GR5: a map from Kanne to Nice, with cafés, hotels, supermarkets and stations along the route.
- Eastern castle route (GPX): an alternative of sorts to the Pieterpad, but along castles.
- Western castle route (GPX): its western cousin.
The downloadable GPX files can be viewed with gpx.studio.
Bike tracks
I snapped these bike routes to OpenStreetMap (OSM) data from September 2026. The list links to each GPX file and to the original route source.
- 10-provincieënpad (GPX, September 2026). Original route: Tien-Provincienroute. More information: Oppad.
- Fietserpad (GPX, September 2026). Original route: Fietserpad. More information: Oppad.
About me
Read my biography and contact details. Another site I enjoy: chess.ceo, a free chess workstation.