1992-2016 Group leader and project leader, KIT/IMK-IFU (since 2009); Forschungszentrum Karlsruhe (2002-2009); Fraunhofer Institute for Atmospheric Environmental Research (1992-2001), Garmisch-Partenkirchen (same institute) 1988 Professor of atmospheric physics, Academy of Sciences of GDR 1987 Doctor thesis B (Dr. sc. nat.), Academy of Sciences of GDR 1984 Leader of the department of atmospheric research, Academy of Sciences of GDR, Heinrich-Hertz-Institute of Atmospheric Research and Geomagnetism, Berlin 1979 Doctor thesis A (Dr. rer. nat.), Academy of Sciences of GDR 1973-1991 Research scientist, Academy of Sciences of GDR, Central Institute of Solar-Terrestrial Physics, Potsdam (1973-1978), Berlin (1978-1983), Heinrich-Hertz-Institute of Atmospheric Research and Geomagnetism, Berlin (1983-1991) (same institute) 1973 Diplom-Physiker (physicist, equivalent to MSc), University of Rostock