Prof. Leszek R. Jaroszewicz, PhD, DSc, Eng, SPIE Fellow is director of the Institute of Applied Physics Military University of Technology as well as Editor -in-Chief of the Opto-Electronics Review journal (IF=1.611). Since 1984 he has been engaged in the research of fibre-optic coherent transmission, FOGs and interferometric and polarimetric optical fibre sensors including wide scope of the fibre optic Sagnac interferometer’s applications as a sensor of a variety of physical fields. At present the main field of his interest is photonics technology application for sensors devices including: hybrid liquid crystal waveguide transducers, new technologies of monocrystals and glasses manufacturing especially the oxide type, technologies of advanced fibre optics and photonic crystal fibre elements as well as fibre-optic rotational seismograph R&D. He is non-official photograph of OFS, also.