As of 1 September 2023, Sławosz Uznański joined ESA as a project astronaut anticipating flying on a future space mission. Sławosz was selected in November 2022 as a member of the ESA astronaut reserve after a year-long selection process. The 2022 ESA recruitment campaign received more than 22 500 applications from across its Member States. Sławosz joined the European Astronaut Corps on 1 September as an ESA project astronaut for the duration of his mission duties.
This picture shows him on his first day at ESA's European Astronaut Centre (EAC) next to Head of EAC Frank De Winne and ESA astronaut Alexander Gerst.