I am Editor of  Journal de Théorie des Nombres de Bordeaux and Journal of Computational Algebra.

I was in the organizing comittee of the following conferences:

• GDMV-Tagung, Paderborn, Deutschland, 05.-09. März 2018.

I was in the program comittee of the following conferences:

• DMV-Tagung, Saarbrücken, Germany, September 17th - September 20th, 2012 (Member of the Program Committee, Section Number Theory)
• ANTS-X, Tenth Algorithmic Number Theory Symposium, University of California, San Diego, July 9th - 13th, 2012
• ANTS VIII Banff, Canada, May 17th - May 22nd, 2008 (Member of the Program Comittee)
• ISSAC 2008 Hagenberg, Austria, July 20th - July 23rd, 2008 (Member of the Program Comittee)