Hans Muller works as a Wikipedian in Residence at the African Library. After a career as an archivist, physicist (PhD Utrecht, 1996) and astronomer, he has been working as a Wikipedian in Residence for Dutch academic libraries since 2013. At the ASCL he contributes articles on Africa and African Studies to Wikipedia in various languages, uploads collections of Africa related photographs to the image database Wikimedia Commons, and gives instructional courses on Wikipedia.