Tim de Haan is Open Data advisor at the National Archive of the Netherlands. He has been involved with making available the collection data of the National Archive as open data. In 2013 in a collaboration between the National Archive and the Royal Library of the Netherlands, he accompanied the Wikimedian in Residence-project. He is also an active Wikimedian as [[User:Timmietovenaar] by uploading visual material on Wikipedia’s image database Wikimedia Commons for the purpose of illustrating lemma’s on Wikipedia.