- Research assistant University Mainz, 1970-1972. Research associate National Aeronautics and Space Administration, Greenbelt, Maryland, 1972-1973, University Mainz, 1973-1976, professor physics, since 1976, head Institute, 1982-1983, vice director Institute Physics, 1983-1985. Chairman European Group Atomic Spectroscopy, 1989-1994.
- Chairman European Group Atomic Spectroscopy, 1989-1994. Editor: Current Status and Aims of Quantumelectrodynamics, 1980. Contributor articles to professional journals.