Prof. Nagli received his MS degree from the Latvian State University, Riga, in 1964, in 1971 he received the PhD (Solid State Physics, candidate of science) and in 1988 Doctor of science from the Institute of Physics, Latvian Academy of Science. For 25 years he was a staff member at the Institute of Physics, Latvian Academy of Science Riga. Lev is professor in the School of Physics and Astronomy, Tel-Aviv University. His research interests are in optics, laser technique, laser materials, Infrared spectroscopy, infrared materials, infrared fibers.