Sergey Krikalev is a Russian former cosmonaut and engineer, known for his significant contributions to space exploration. Born on August 27, 1960, he flew on six space missions, including long-duration stays aboard the Mir space station and the International Space Station (ISS). Krikalev holds the record for the most time spent in space by a human, totaling over 803 days. He played a crucial role in the assembly and operation of the ISS and has been recognized with numerous awards for his achievements in the field of space science and technology.