Professor for Ecosystem Science/Plant Ecology at Technische Universität Berlin; training as landscape planner and ecologist; PhD in 1988; full professor at Universität Hannover (1992-1999) and TU Berlin (1999-2022); Berlin's honorable State Commissioner for Nature Conservation and Landscape Management (2002-2022); expertise in urban ecology, nature conservation, biological invasions; honorary president of Neobiota, honorary member of SURE.