Sławosz Uznański-Wiśniewski

Sławosz Uznański-Wiśniewski (born 12 April 1984) is a Polish astronaut and engineer working at the European Space Agency (ESA), formerly employed at CERN. In June 2025, he became the second Polish national to go to space, marking the country's return to crewed spaceflight after nearly 47 years and its first mission aboard the International Space Station. He was the 701st person in space and the 635th person to reach orbital flight.