Prof. Alex PAPAYANNIS (Dipl. Electrical Eng. (1984)-National Technical University of Athens-NTUA, Greece; DEA (1985) and Ph.D. (1989)-Universite Paris 7 (Supervisor Prof. Gerard Megie), Paris France, in Physical Methods in Remote Sensing). From 1990-1996 he worked both in the Aristotle University of Thessaloniki and the National Technical University of Athens, Greece, in laser remote sensing of the atmosheric ozone-aerosols-bioaerosols (lidar-DIAL-Fluorescence techiques) (first lidar system in Greece 1993) and in laser development (Nd:YAG, CO2, HF, N2 lasers).