Member of the European Symposium on Algorithms Steering Committee (2013-2017).
Member of the Scientifc Council of the SIF (French Society for Computer Science)
Member of the Editorial Board of the CGAL Open Source Project.
Member of the Editorial Boards of
CGTA, Computational Geometry: Theory and Applications, since August 2009.
IJCGA, International Journal of Computational Geometry and Applications, since August 2008.
Member of the program committee of SoCG'15, 31st International Symposium on Computational Geometry.
Co-organizer of Dagstuhl Seminar on Computational Geometry, with Otfried Cheong and Jeff Erickson, Leibniz-Zentrum für Informatik, Germany, March 9-13, 2015.
Webmaster of the Computational Geometry Web Pages since 2007.
Member of the Computational Geometry Steering Committee (2009-2013).
CGAL Review Manager (spring 2010 - spring 2012)
Guest editor of a
of Discrete and Computational Geometry (Volume 42, Number 3 / October 2009).
Guest editor of a Special Issue of CGTA (Volume 43, Issue 3 / April 2010).
Member of the program committee of ESA'14, European Symposium on Algorithms.
Member of the program committee of EuroCG'13, European Workshop on Computational Geometry.
Member of the program committee of WADS'11, Algorithms and Data Structures Symposium.
Member of the program committee of ICMS'10, Third International Congress on Mathematical Software.
Member of the Video/Multimedia committee of SoCG'10, 26th Annual Symposium on Computational Geometry.
Program committee chair of SoCG'08, 24th Annual Symposium on Computational Geometry (Scoring Instructions).
Video/Multimedia committee chair of SoCG'07, 23rd Annual Symposium on Computational Geometry.
Member of the program committee of ICCV'07, 11th IEEE International Conference on Computer Vision.
Member of the program committee of SoCG'05, 21st Annual Symposium on Computational Geometry.
Member of the program committee of Alenex'05, 7th SIAM Workshop on Algorithm Engineering and Experiments.
Organization of scientific events:
ALGO'13 (local committee chair), Sophia Antipolis, September 2-6, 2013.
Workshop on Geometric Structures with Symmetry and Periodicity, part of the Computational Geometry Week 2014, with Ileana Streinu, Kyoto University, Japan, June 8-9, 2014.
Dagstuhl Seminar on Drawing Graphs and Maps with Curves, with Stephen Kobourov and Martin Nöllenburg, Leibniz-Zentrum für Informatik, Germany, April 8-12, 2013.
Dagstuhl Seminar on Computational Geometry, with Otfried Cheong and Kurt Mehlhorn, Leibniz-Zentrum für Informatik, Germany, March 4-8, 2013.
Workshop on Geometric Computing, with Olivier Devillers, Menelaos Karavelas, and Elias Tsigaridas, Heraklion, Crete, Greece, January 21-25th, 2013.
Workshop SIGMA'2012: Signal, Image, Geometry, Modelling, Approximation (member of the scientific committee), Marseille, November 19-23, 2012.
Minisymposium on publicly available geometric/topological software, with Menelaos Karavelas, Chapel Hill, USA, June 17&19, 2012.
Dagstuhl Seminar on Computational Geometry, with Pankaj K. Agarwal and Kurt Mehlhorn, Leibniz-Zentrum für Informatik, Germany, March 13-18, 2011.
Workshop on Computational Geometry, with Olivier Devillers, INRIA Sophia Antipolis - Méditerranée, December 8-10, 2010.
Session on Exact numeric computation for algebraic and geometric computation in the Third International Congress on Mathematical Software with Chee Yap and Michael Sagraloff, Kobe University, Kobe, Japan, September 13-17, 2010.
Subdivide and Tile: Triangulating spaces for understanding the world, with Gert Vegter and Rien van de Weijgaert, Lorentz Center, The Netherlands, 2009.
Dagstuhl Seminar on Computational Geometry, with Pankaj K. Agarwal and Helmut Alt, Leibniz-Zentrum für Informatik, Germany, 2009.
CGAL Prospective Workshop on Geometric Computing in Periodic Spaces, with Andreas Fabri, 2008.
Workshop on Robust Shape Operations, 2007.
Workshop on Effective Computational Geometry for Curves and Surfaces, with Jean-Daniel Boissonnat, 2004.
Workshop on Robustness and Efficiency Issues in Implementing Arrangements of Curves and Surfaces, with Dan Halperin, 2002.
Prisme Seminar until fall 2000.
Journées de géométrie algorithmique, with Bernard Lacolle, CIRM, 2000.
Journées de géométrie algorithmique, 1998.
Member of the selection committee of the Agrégation de Mathématiques, 2009-2011 (rapports : 2009, 2010, 2011).
Motion du jury 2010 - Démission de 30 membres du jury, 2012 - Formations des enseignants en crise
Elected member of the Evaluation Committee (Sept 2005- July 2014).
PES: La recherche en danger - Lettre sur la PES - Pas duPES - Sauvons la recherche
Member of the national committee evaluating the proposals for Actions de Développement Technologique (internal site) (2010-2012).
Member of the Commission de développement technologique (Commission for technologic development) (2009-2014).
Member of the Comité de suivi doctoral (Committee for doctoral monitoring) (2007-2009).
Member of the COLOR (Local Research Collaborations) committee (2006, 2007, 2009, 2010).
Member of the Hygiene and Security Commission (2000-2007).
Elected member of the Comité de Centre (Laboratory committee) (many years, until end 2004). Webmaster of this committee for a few years.