Retired Professors Count Persons (12) Contact Phone E-Mail Details Prof. Dr. Bernd Diekkrüger In retirement since 01.10.2019 - b.diekkrueger@uni-bonn.de Prof. Dr. Richard Dikau In retirement since 01.03.2016 - ridikau@uni-bonn.de Prof. Dr. Eckart Ehlers In retirement since 01.04.2004 - ehlers@geographie.uni-bonn.de Prof. (em.) Dr. Klaus Fehn In retirement since 01.04.2001 - k.fehn@uni-bonn.de Prof. Dr. Klaus Greve In retirement since 01.08.2023 - klaus.greve@uni-bonn.de Prof. Dr. Reinhold Grotz In retirement since 01.04.2004 - grotz@geographie.uni-bonn.de Apl. Prof. Dr. Hans Dieter Laux In retirement since 01.04.2007 - hdlaux@geographie.uni-bonn.de Prof. Dr. Winfried Schenk In retirement since 01.09.2022 - winfried.schenk@giub.uni-bonn.de Prof. Dr. Helmuth Toepfer In retirement since 01.03.2009 - toepfer@geographie.uni-bonn.de Prof. Dr. Sabine Tröger In retirement since 01.04.2020 - troeger@giub.uni-bonn.de Prof. Dr. Claus-Christian Wiegandt In retirement since 01.04.2023 - wiegandt@uni-bonn.de Prof. Dr. Matthias Winiger In retirement since 01.04.2011 - winiger@uni-bonn.de