What a university professor does ... I am or was a member of the following academic societies, working groups etc.:

• Conference for History Didactics. Association of History Didacticians in Germany (KGD)
• Society for the Didactics of Subject Teaching (GDSU), 2005 to 2007 as Chair
• German Association of Historians (Verband der Historiker und Historikerinnen Deutschlands e. V.)
• Editorial board of the journal "Geschichte lernen" (1996-2025)
• Historical Commission for Lower Saxony and Bremen (member since 1996, member of the commission's committee since 2016)
• Lower Saxony Contemporary History Working Group
• Scientific Advisory Board at the Northwest German Museum of Industrial Culture(Deputy Chairman)
• Expert Commission for the Promotion and Further Development of Memorial Site Work at the Lower Saxony Memorials Foundation (from 2005-2025; Deputy Chair and 2016-2025 Acting Chair)
• sowi-online e. V.
• Working group for the history of the 19th and 20th centuries
• Working group for state and regional history in the Oldenburgische Landschaft(since 2014 Chair together with Prof Dr Gerd Steinwascher)
• Advisory board of the Oldenburgische Landschaft
• Advisory board of the Oldenburg State Association for History, Nature and Local History e.V.
• Research Centre for Children's and Youth Literature(Director 2013 to 2015, since then on the Board)
• Accreditation Commission for Programme Accreditation (or from 2019: Standing Commission) at AQAS e.V. (from 2011 to 2021; 2016 to 2021 Deputy Chair)
• Jury for the Oldenburgische Landschaft "Forschung Regional" funding award for students in the Oldenburg region
• Advisory board for the project "The Münster city administration during the Nazi era"
• Scientific advisory boards for the redesign of several memorial sites in Lower Saxony (Augustaschacht and Gestapo cellar Osnabrück; Liebenau; Engerhafe)