Sergey Krikalev

Sergey Krikalev is a renowned Russian cosmonaut and engineer, widely recognized for his extensive experience in space missions. He holds the record for the longest total time spent in space, with over 803 days across six flights. Krikalev's career has made significant contributions to human space exploration, including participation in the Mir space station program and the International Space Station (ISS) missions. He served as the head of the crew training center at the Russian Federal Space Agency (Roscosmos) before stepping down from his role as the representative for international cooperation in space.