Companies and organizations I have worked for include

Central Michigan University, Mount Pleasant, Michigan, United States
Corrie ten Boom Museum, Haarlem, The Netherlands
Erasmus School of History, Culture and Communication, Erasmus University Rotterdam, Rotterdam, The Netherlands
Jac. P. Thijsse College, Castricum, The Netherlands
Kleio: Magazine of the Dutch History Teachers Association, Breda, The Netherlands
KNHG / BMGN - Low Countries Historical Review, The Hague, The Netherlands
Luzac Lyceum Amsterdam, Amsterdam, The Netherlands
Malmberg: Educational Publisher, Bois-le-Duc, The Netherlands
Sqills Products b.v., Enschede, The Netherlands
Studelta, Amsterdam, The Netherlands