From 1988 to 1993 he was a C2 professor at the Faculty of Economics and Social Sciences of the University of Erlangen-Nuremberg and from 1993 to his retirement in 2009 he held the chair of Psychology II, Methods, Diagnostics and Evaluation at the Faculty of Social Sciences of the University of Mannheim.
His interest in collaborative research projects, teaching and international exchange led to several visiting professorships, among others at the universities Heidelberg, Berlin.
At the centre of Werner Wittmann's work is an attempt to unite the sometimes contradictory methods and goals of experimental and non-experimental research approaches in the social and behavioural sciences.
Boruch, Egon Brunswik, L. Sechrest, Gene V. Glass, Raymond Bernard Cattell and Kenneth Hammond.
Werner Wittmann's integrative thinking made him a pioneer of evaluation research in Germany, opened up new perspectives for solving fundamental challenges of translational research methodology, and made him a pioneer of evidence-based decisions in health care.