- 1994 founder of GUI Design.
- Usability consultant ever since.
- since 2003 Professor for Man-Machine-Interfaces and Software Engineering at University of Applied Sciences Esslingen.
- Speaker at conferences.
- Din expert.
- Certified Tester and Trainer (ISTQB).
- DGQ Quality Manager.
- Member of: German UPA. GI. SENS.
- studied Computer Science at TU Berlin (Diploma) and at Univ. of Southern California (M.Sc.)