Roland H. Tarkhanyan received his Ph.D. degree in Physics in 1966 from the A.F. Ioffe Phys. Tech. Institute, St. Petersburg, Russia, and his Dr. Habil. degree in Physics and Mathematics in 1980 from the High Examining Board in the Ministerial Council of the USSR, Moscow. He started working with the Institute of Radiophysics and Electronics of the National Academy of Sciences, Republic of Armenia, in 1966 and now holds the position of Leading Scientist there. Among his other postitions were a professorship at Yerevan State University and a post as Visiting Researcher at the Technical University of Athens and at the Greek National Research Center 'Demokritos'. He is the author of 87 publications in refereed international journals on theoretical solid state and semiconductor physics.

Nikolaos K. Uzunoglu received his M.Sc. and Ph.D. degrees in 1974 and 1976 from the University of Essex, UK. Since 1987 he is Professor of the National Technical University of Athens, Department of Electrical Engineering, where he was elected as Chairman twice. His research interests include electromagnetic scattering radiation phenomena, fiber optics telecommunications and high speed circuits. In 1981 he obtained the International G. Marconi award in Telecommunications. He has published over 200 articles in journals as well as three books on Microwaves, Fiber Optics Telecommunications and Radar Systems.