In memory of Vladislav Borisovich Rozanov (11 December 1932 – 5 September 2019)

V.B. Rozanov made a huge contribution to the formation and development of research in the theory of laser fusion. He founded the Sector of the Laser Plasma Theory at the Lebedev Physical Institute, which he headed for 45 years. Under the leadership of V.B. Rozanov, the Sector has become one of the leading teams in the world, successfully working in almost all areas of the theory of laser plasma and laser fusion. With his active participation, models of the main physical processes of laser fusion were developed, which have become the basis for the development of mathematical program algorithms for the numerical simulation of compression and burning of thermonuclear targets; these algorithms were implemented in creative collaboration with scientists of the Keldysh Institute of Applied Mathematics, Russian Academy of Sciences. V.B. Rozanov is one of the authors of the concept of the target in the form of a thin spherical shell designed to achieve ultrahigh compressions of matter and high thermonuclear gain coefficients. All modern laser fusion target schemes are based on this concept. Vladislav Borisovich is the author of the 'evolutionary' theory of the development of hydrodynamic instabilities. He made a significant contribution to the development of the physics of a fusion – fission hybrid reactor during controlled initiation of a nuclear reaction by thermonuclear neutrons. V.B. Rozanov is one of the pioneers in this field; he is the author of several promising schemes of reactors of this type.