Hendrik (Henk) Koppelaar (born February 1953) is a Dutch computer scientist and emeritus professor at the Delft University of Technology, knows for his work in knowledge engineering. Koppelaar started his studies at the Utrecht University in 1971, where he graduated in Physics in 1976. In 1981 he started his graduate study at the University of Amsterdam, where he obtained his PhD in Computer and Information Sciences and Support Services in 1984. Under supervision of Gideon J. Mellenbergh and J.K. de Vree (1938-2017) he wrote his thesis on the theory and new ways of data processing in modeling in the social sciences.