Studies of Biology, Chemistry, and Pedagogics at Philipps-University Marburg, Germany. Degree received (1977): 1st state examination (grammar school teacher); in 1980 Ph. D in microbiology at Philipps-University Marburg; 1981-1985 Postdoctoral fellow at the Botanical Institute of Albertus-Magnus University, Cologne; 1986 Postdoctoral fellow at 'Laboratory for Nitrogen Fixation Research', Oregon State University, Corvallis, OR, USA; since 1987 at IMK-IFU; in 1999 Habilitation in 'Soil Microbiology' at Albert-Ludwigs-University Freiburg, Germany, and appointment as Vice-Director of IMK-IFU; in 2005 appointment as Associate Professor at the Faculty of Forest and Environmental Sciences of Albert-Ludwigs-University Freiburg, Germany.
- Impact of Global Change parameters on the coupled cycles of C and N and biosphere-atmosphere exchange of primary and secondary climate relevant trace substances (N2O, CH4, CO2, NO, NO2)
- Forest conversion and resource protection
- Physiology and biochemistry of microbial processes and populations involved in N- and C-trace gas production, -consumption and –emission (nitrification, denitrification, ammonification, methanogenesis, methane oxidation)
- Plant/microbe interactions and functional biodiversity
- Microbial processes involved in nitrate-production and –consumption (e.g. nitrification, immobilization)