Co-chairman and European Coordinator on behalf of the European Commission of the NSF-EC Joint Workshop on "Methods in Computational Materials Science", San Francisco, April 15th to 16th, 2004 (http:// www.itamit.dtc.umn.edu/nsfreport.php).
Co-Chairman du IUTAM Symposium sur Multi-scale Plasticity of Crystalline Materials, 5-9Nov. 2007, Einhoven, The Netherlands.