Studied law, maths and politics in Munich and Regensburg. 1970 first State examination, 1974 second State examination. Studied at Harvard Law School (LL.M.) in 1972. Promotion in 1974, habilitation in Munich in 1977. Professor in Berlin from 1978, in Bochum from 1982, and in Münster since 1995 (German and European public law). Director of Zentralinstitut für Raumplanung research institute for German and European public law at Münster university since 1996.
Works as of counsel for the firm since 2010.
Legal expert at the law council of Deutsche Forschungsgemeinschaft and at the scientific advisory board of Akademie für Raumforschung und Landesplanung. Board member of Gesellschaft für Umweltrecht. Research periods, among others, in USA, France, Great Britain, China, and Japan.
Publications, among others, on constitutional, environmental, European law, esp. commentaries “Grundgesetz für die Bundesrepublik Deutschland” (14th ed. 2016), “Charta der Grundrechte der EuropäischenUnion” (3rd ed. 2016), “Bundes‐Immissionsschutzgesetz” (12th ed. 2017) and “Kreislaufwirtschafts‐ und Abfallgesetz”.