Passage: Jürgen Kurths is an elected fellow of the American Physical Society (1999). He received an Alexander von Humboldt research award from Council of Scientific and Industrial Research (CSIR) (India) in 2005. He has become a member of the Academia Europaea in 2010 and of the Macedonian Academy of Sciences and Arts in 2012 and was bestowed with a Dr. honoris causa from the Lobachevsky University in Nizhny Novgorod in 2008 and one from the Chernishevsky University, Saratov. He is honorary professor at the University of Potsdam and guest professor at the Southeast University in Nanjing. He was awarded the Lewis Fry Richardson Medal of the European Geosciences Union in 2013.

Question: In which educational institution is he an honorary professor?
University of Potsdam