Sergiy F. Lyagushyn was born in 1955 in Dnipropetrovs’k (Ukraine, USSR). Graduated from the Physical Department of M.V. Lomonosov Moscow State University in 1978. Studied and worked at the Quantum Statistics and Field Theory Division headed by Academician N.N. Bogolyubov. Finished post-graduate courses in Moscow State University in 1988 (supervisor – Prof. N.N. Bogolyubov (Jr.)). Defended a thesis “Correlation Effects in Radiation of Systems with Finite Number of Levels” in 1989. Worked in Dnipropetrovs’k since 1988. Dealt with problems of rocket thrusters and space power supply in Experimental Design Office “Foton”. Published some papers devoted to renewable power sources, diffraction optical elements, and space solar power. Was a member of two committees of the International Astronautical Federation in 1990-ies. Since 1992 Associate Professor of the Quantum Macrophysics Division of Dnipropetrovs’k University (now – Theoretical Physics Division), in 1994-2007 Deputy Dean of the Physics Department. Present sphere of scientific interests – nonequilibrium statistical physics and quantum optics. Main publications on this field – in Physica A, Physics of Particles and Nuclei, Journal of Dnipropetrovs’k National University (Physics & Radioelectronics series).