Born in Poland in 1984, Sławosz is a scientist and engineer. Before his selection, he was working for the European Organization for Nuclear Research (CERN), where he oversaw the creation of a radiation-tolerant power converter control system which has been a core part of the Large Hadron Collider.
In his leisure time, Sławosz is outside testing his limits on high-altitude mountaineering expeditions, travelling to remote places or on a sailing boat, taking part in competitive regattas.
His mission to ISS launched on 25 June 2025. Sławosz and his Ax-4 crew mates spent 18 days on the ISS, together carrying out over 60 research activities and taking part in more than 20 outreach events, before undocking from the station on 14 July The next day, the crewed capsule splashed down in the Pacific Ocean, ending their mission on Tuesday, 15 July, 2025.
