Alexander Radzig: dedicated to the 150th anniversary of birth

The article contains biographical data and information about the creative path of a major scientist in the field of heat engineering and mechanics. The main stages of A.A. Radzig's pedagogical activity in Kiev and Leningrad Polytechnic institutes are reflected. His main works on thermodynamics, thermal engineering, applied mechanics and history of thermal engineering are mentioned. The role of A.A. Radzig as the found-er of the Leningrad school of turbo-builders is emphasized.