Amongst other titels, Klaartje has written for media including:

And organisations like

  • University of Rotterdam
  • University of Leiden
  • EUSJA
  • Science Unlimited
  • STROOM Den Haag
  • Culturalis Theater
  • Kosmopolis Den Haag
  • Nutshuis
  • El Islam
  • Mobile Orchards
  • Kamer van Koophandel (Chambre of Commerce)
  • LeasePlan International
  • Contact Consulting
  • Arts Media
  • Vlisco