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.