Polish painter, draughtsman and graphic artist, member of the Kraków Group and collaborator of the Cricot Theatre. Between 1927 and 1932, Osostowicz studied painting at the Academy of Fine Arts in Kraków. Arrested multiple times for his radical political activity, he was expelled from the Trade Union of Artists in 1937 for political reasons. Osostowicz is known for his sharp, engaged works on paper and expressively painted colourful landscapes and scenes from small-town life. He moved to Warsaw in 1937, where he died during bombing in 1939.