Ornithologist and living in the city of Groningen (The Netherlands). Holding a MSc in Animal Ecology of the University of Groningen (RUG, The Netherlands). Member of expeditions of WIWO (Working Group International Waterbird and Wetland Research) to the Taimyr peninsula in northern Siberia in 1993, to the Kizilirmak delta in Turkey in 1992, and to the Gulf of Gabès in Tunisia in 1984. Employed as regional officer by BirdLife The Netherlands (Vogelbescherming Nederland) in 1995-2004. Afterwards at intervals employed by Altenburg & Wymenga ecological consultants. Current research topics include: winter ecology of urban Black-headed Gulls; breeding biology, dispersal and moult strategies of Egyptian Geese; long-term developments in waders and waterfowl on the island of Schiermonnikoog (Wadden Sea).
The list with publications ('Works') is incomplete. See also https://www.researchgate.net/profile/Klaas_Van_Dijk and https://scholar.google.es/citations?user=hmhMcScAAAAJ&hl=en