Contact us?

Do you want personal contact, share a story or just ask a question? Then you can contact us in the following ways.

Visit us


Are you an e-mail ninja for whom every sent e-mail is a personal victory, but you don’t know anyone at Mastermind yet? Then you should e-mail us at [email protected].


Next to Ellen-Claire Heinis, on the windowsill, we still have a beautiful, old-fashioned telephone, wired to the wall. You can make it ring by calling +31 (0)23 555 1225.