Hans Colonius studied psychology with a minor in mathematics at Göttingen University and at Technical University of Braunschweig, where he graduated with a diploma in psychology in 1973. Supported by Studienstiftung, he received his doctorate in Braunschweig with a dissertation on the "Role of the Archimedean and related axioms in fundamental measurement''. He was a research fellow at the psychology department of New York University from 1978-79 and obtained his venia legendi from Braunschweig University in 1982 (thesis on "Stochastic models of individual choice behaviour''). After being awarded a Heisenberg professor fellowship from DFG in 1982 he became professor of experimental psychology and methods at Oldenburg University in 1983. He was visiting professor at the University of Montpellier in 1987, and at Purdue University (Indiana) from 1988-91. He has since been with the department of psychology at Oldenburg. His research has been funded by numerous grants from DFG, Volkswagenstiftung, Humboldt-Stiftung, DAAD, and NSF. He is member of the Interdisciplinary Research Center for Neurosensory Science at the Carl von Ossietzky University Oldenburg and principle investigator in the center of excellence "Hearing-for-All" at Oldenburg. He is editorial board member of "Journal of Mathematical Psychology" (Editor-in-chief 1995-‐2000) and European representative for the Society for Mathematical Psychology. He is reviewer for Psychological Review, Current Biology, Experimental Brain Research, Journal of Neuroscience, and numerous other journals. He is a frequent reviewer for DFG, NSF (National Science Foundation), and various departments of psychology.