G.J. Mellenbergh is hoogleraar psychologische methodenleer aan de Faculteit der Psychologie van de Universiteit van Amsterdam.
Gideon J. Mellenbergh is emeritus professor of Psychological Methods at the University of Amsterdam, former director of the Interuniversity Graduate School of Psychometrics and Sociometrics, and emeritus member of the Royal Netherlands Academy of Arts and Sciences. His research interests are in the construction of psychological and educational tests, psychometric decision-making, measurement invariance, and the analysis of psychometrical concepts. His teaching was on a large number of methodological topics (designs, measurement, and statistical analysis) for audiences that vary from freshmen to dissertation students. Recently, he teaches courses on methodological consultancy for research master and dissertation students. He published in international methodological journals (e.g., Applied Psychological Measurement, Journal of Educational Measurement, Multivariate Behavioral Research, Psychological Methods, and Psychometrika), contributed to methodological books, and (co-) supervised 88 PhD students who successfully defended their thesis.