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Local
- Head and deputy head of Department of Mathematics of University of Oldenburg, terms 2015-2016 and 2017-2019.
Computeralgebra
- Member of the steering committee of the Fachgruppe Computeralgebra of GI/DM/GAMM (since 2008, chair 2012-2015).
- Member of ISSAC steering committee, term 2015-2017.
- I have been involved in the number theoretic computer algebra system Kant and its shell KASH (see the Kant project) developed at TU Berlin and Magma at University of Sydney. Kant is also available through Magma.
- DFG projects.
Cryptography
- Member on the steering committee of the Fachgruppe Kryptologie of GI, 2009-2017.
- Involved in PhD program OLCRYPT.
- Associate member of the past EU funded Network of Excellence ECRYPT 2.
- BMBF and DAAD projects.
Organising and Chairing Conferences
I have been involved in a number of conferences from algorithmic number theory and cryptography, like
- Conference on Number Theory, Berlin, 2005 (co-organisation and programme co-chair)
- Algorithmic Number Theory Symposium (ANTS) VII, Berlin, 2006 (co-organisation and programme co-chair)
- Information Security and Cryptology : Second Sklois Conference, Inscrypt 2006 (programme committee)
- Western European Workshop on Research in Cryptology -- WEWoRC -- 2007 (programme committee)
- Sicherheit 2008, Tagung der Gesellschaft für Informatik (programme committee)
- Algorithmic Number Theory Symposium (ANTS) VIII, 2008 (programme committee)
- Pairing 2009 (programme committee)
- Sicherheit 2010 (programme committee)
- Workshop on Resolution of Singularities and Semistable Reduction, Hannover, 2010 (co-organiser)
- North German Algebraic Geometry Seminar NoGAGS, Oldenburg, 2010 (co-organiser)
- Elliptic Curve Cryptography ECC 2011 (programme committee)
- Western European Workshop on Research in Cryptology -- WEWoRC -- 2011 (programme committee)
- 15. Kryptotag der Fachgruppe Kryptologie der GI 2011, Oldenburg (organiser)
- Western European Workshop on Research in Cryptology -- WEWoRC -- 2013 (programme committee)
- Algebraic Curves and Cryptography, Oldenburg, 2013 (organiser)
- ANTS 2016 Kaiserslautern (programme committee)
- Workshop on Arithmetic Geometry and Computer Algebra, Oldenburg, 2017 (co-organiser)
- Gauß Lecture, June 2018 Oldenburg (co-organiser)
- ANTSXVII 2026 Groningen (organising committee and pc co-chair)
- ISSAC 2026 Oldenburg (local co-organiser, treasurer)