Habilitation (Professorial Dissertation): A Landscape-Ecological Perspective on the Biogeography of Arctic-Alpine Landscapes—Patterns and Processes in Space and Time (University of Bonn) PhD Disseration: Near-Surface Temperature Conditions in High Mountain Environments—Analysis, Modeling Approaches and Ecological Relevance pdf (University of Oldenburg) Co-Chair of German Biogeography Study Group (AK Biogeographie, DGfG)