1977
| Doctoral thesis on "Geophysical interpretations of geographic latitude variations"
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1981 - 1985
| Research scientist and lecturer at Institute for Geodesy and Photogrametry, Division for Astronomical and Physical Geodesy, in Breslau
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1985 - 1987
| Alexander-von-Humboldt Fellowship at the Institute for Astronomical and Physical Geodesy, Technical University Munich
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1988
| Research scientist at Institute for Astronomical and Physical Geodesy, Technical University Munich
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1988
| Research scientist at Deutsches Geodätisches Forschungsinstitut, Division 1 Theoretical Geodesy, Munich
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1989 - 1990
| Research scientist at Astronomical Observatory of Bonn University
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1991 - 1992
| Senior scientist at Deutsches Geodätisches Forschungsinstitut, Division 1 theoretical Geodesy, Munich
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1993 - 2007
| Senior scientist at GeoForschungsZentrum Potsdam
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2008
| Professor for precise navigation and -positioning at Technische Universität Berlin
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