Academic positions
| 
			 1995, Apr. -  | Senior
			Researcher and Lecturer at the University of Cologne, Institute of Didactics
			and Educational Research | 
| 1994, Apr. – 1995, March | Researcher at Universitat de Barcelona with a research grant from the European Commission (Human Capital and Mobility Programme), collaborating with Antonio Bartolomé | 
| 1993, Apr. – 1994, Febr. | Senior Researcher and Lecturer at Cologne University, Department of Education | 
| 1992, Oct. – 1993, March | Professor for Educational Psychology at University of Erfurt, Department of Education | 
| 1991, Oct. – 1992, Sept. | Professor for Educational Psychology at Johann-Wolfgang-Goethe University Frankfurt, Department of Psychology | 
| 1977, Sept. – 1991, Sept. | Researcher and Lecturer at University of Cologne, Department of Education | 
| 1977, February | PhD at University of Bonn, Department of Psychology | 
| 1976, Sept. – 1977, Aug. | Assistant at University of Cologne, Department of Education | 
| 1974, Sept. - 
			1976, Aug. | Research Assistant at Teachers’ College Bonn, Department of Psychology | 
| 1972, Nov. – 1974, Aug. | Research Assistant at University of Bonn, Department of Psychology | 
| 1972, Nov. | Diploma in Psychology at University of Bonn, Department of Psychology | 
| 1967, Oct. – 1972, Nov. | Studies in Psychology, English and Philosophy at Bonn University |