The whole life of Alexander Ryazanov was connected with science. In 1972 he graduated from the Faculty of Experimental and Theoretical Physics of the Moscow Engineering Physics Institute. He worked at the Kurchatov Institute since 1972. He rose from an engineer-physicist to the head of a department. In 1998 he defended his Doctor of Science dissertation, and in 2000 he was awarded the title of professor. A.I. Ryazanov was a leading specialist in Russia in solid state radiation physics, as well as theoretical and experimental research in the field of radiation materials science for the development of nuclear power.