Alexander Kaleri is a Russian cosmonaut born on December 24, 1956. He has completed multiple spaceflights, including missions to the Mir space station and the International Space Station (ISS). Kaleri is known for his extensive experience in space exploration, having spent over 770 days in space throughout his career. In addition to his work as a cosmonaut, Kaleri is an engineer and has contributed to various scientific research projects. He was part of the Soyuz program and participated in several important missions, helping to advance human understanding of living and working in space.