“GEO BON Open Science Conference and All-Hands-Meeting”4-8th July 2016, Leipzig, Germany (Organizer).
“Evolutionary Ecology of Fishes” 23-25 November 2009, Berlin, Germany (Organizer).
“12th International Congress of European Ichthyologists (ECI XII)” 9-13 September 2007, in Dubrovnik, Croatia (Convenor of the Symposia. Conservation of freshwater fish).
“11th International Congress of European Ichthyologists (ECI XI)” 6-10 September 2004, Tallinn, Estonia (Convenor of the Symposia 7.: To be or not to be: freshwater fish conservation)
“9th International Congress of European Ichthyologists (CEI)” 24-30 August 1997, Trieste, Italy (Member of International Steering Committee and Symposia Convenor, Part: Adaptive Ecology)
“Second International Symposium on the Biology of the Genus Chondrostoma Agassiz, 1835” 10-13 October 1996, Bonn, Germany (Organizer).
“Freshwater Fishes of Tropical Ecosystems: Threats and Protection” 9-12 March 1995, Bonn, Germany (Organizer).