Master's in Urban Planning (Hannover) and Public Administration (Speyer). 1977-85, Head, Urban Environmental Planning, Federal Environmental Agency, Berlin; 1985-87, Project Leader, Environmental Project, Black Forest; 1987-92, Head, Environmental Planning, City of Freiburg, Germany; 1992-2001, Deputy Secretary-General and Regional Director, Europe, ICLEI; 2007, Initiator, Global Alliance, EcoMobility; 2010-11, Chair, Global Agenda Council on Urbanization, World Economic Forum. Member: Association of Town and Regional Planners, Germany; Environmental Law Society, Germany. Author, editor or co-editor of 11 books and numerous articles. Interests: urban sustainability, urban risk, sustainable urban transport.