Sergey Ryazanskiy is an astronaut, a hero of the Russian Federation, a motivational speaker, author of 5 books, and a space photographer. He graduated from the biology faculty of Moscow State University. Worked in the Institute of Medical and Biological Problems of the Russian Academy of Sciences, Ph.D. in Physiology and Aviation and Space Medicine. He was the world's first scientist who became a spacecraft commander. Performed 2 space flights, lasting in total 306 days. Done 4 spacewalks lasting in total 27 hours 35 minutes. Sergey took the 2014 Winter Olympics Torch into open space together with Oleg Kotov. He also participated in the “Mars-500” program as captain of team Mars-105.

Sergey Ryazanskiy is the Chairman of the Russian Schoolchildren's Movement, a public-state children's and youth organization, whose activities are aimed at educating the younger generation, developing children's skills based on their interests and needs, as well as organizing leisure and extracurricular activities of pupils.