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1968-69 Research assistant at the University Leipzig
1970-89 Researcher in the fields of Artificial Intelligence (AI) and Computational Linguistics (CL)
with Robotron, Head of the AI Laboratory
1976 Ph.D. in Computer Science (Promotion, Dr.rer.nat., in the field of AI)
1986 Habilitation (Dr.rer.nat.habil.) in the field of Knowledge Representation
1988-92 Lecturer for Artificial Intelligence at the TU Dresden
1989-92 Researcher at SRS Dresden and Siemens-Nixdorf (Development of Geographic Information Systems)
since 1992 Full Professorship at FernUniversität in Hagen, Head of the Chair: Intelligent Information and Communication Systems
1997-02 Sabbatical Stays at ICSI in Berkeley and at the Universities of Buffalo (USA), Edinburgh, Sheffield and London (Great Britain)