Chairman of the CLEO/Europe Conference on “Fundamentals and Modelling of Materials Processing with Lasers ”, Munich, June (2009).
Co-chairman of the CLEO/Europe Conference on “O3A: Optics for Arts, Architecture, and Archaeology ”, Munich, June (2007).
Co-chairman of EMS-S 2007 Workshop on “Science & Technology of Cultural Heritage Materials: Art Conservation and Restoration ”, Strasbourg, May (2007).
Chairman of Symposium within Laser Optics Conference on “Lasers in the Preservation of Cultural Heritage ”, St. Petersburg, Russia (2006).
Chairman of Topical Seminar CLEO-Europe , Munich, Germany (2005).
Chairman of the 7th International "Conference on “Laser Ablation " (COLA) (2003), Crete, Greece.
Co-chairman of LACONA V "Lasers in the Conservation of Artworks ", Osnabrueck, Germany, (2003).
Co-chairman of the 9th "International Conference on “Multiphoton Processes " (ICOMP IX) (2002), Crete, Greece.
Co-chairman Laser Physics (LPHYS 2002) , Bratislava, Slovakia.
Co-chairman of the 6th International "Conference on Laser Ablation " (COLA) (2001), Tsukuba, Japan.
Chairman of the OWLS V (Fifth International Conference on Optics Within Life Sciences ) on “Biomedicine and Culture in the Era of Modern Optics and Lasers” (1998).
Member of the Steering Committee CLEO/EUROPE (1994 – 2000).
Chairman of the CLEO/Europe (Conference on Lasers and Electro-optics) on "Nonlinear optics and applications of laser spectroscopy " (1996) and "Lasers in Material Processinc " (1998).
Co-chairman of the "Advance Laser Technology " (ALT'96) Conference (1996).
Chairman of the "Lasers in the Conservation of Artworks " (LACONA I) International Conference (1995), Crete, Greece.
Co-Chairman of the 2nd European Physical Society (EPS), "EPS School on Lasers and Applications" and the EPS Workshop on "Lasers and Applications" and the EPS Workshop on "Laser Applications in Medicine and Industry" (1994), Crete, Greece.
Chairman of the 9th International Conference on "Gas Flow and the Chemical Lasers" (GCL) (1992), Crete, Greece.
Member of the International Scientific Committees of several Conferences: COLA, LACONA, ALT “Advanced Laser Technologies ”, LPHYS “Laser Physics”, GCL-HPL, LIBS, OWLS.