Graduated from Leiden University in 1977. Research Associate, Naturalis Biodiversity Center, The Netherlands. He has edited and published "Eels and Humans" (edited and shared by Springer, Japan), "Taxonomy, ecology, and fishery of Lake Victoria haplochromine trophic groups" (co-authored), and "Vissen van Haai tot Koi" (main part of this book). Translated by, Siebold Huis, Leiden) and so on.