Oskar Hansen (1922-2005) - Polish architect, theorist, painter, sculptor and teacher. He studied Mechanical Engineering at the Technical University in Vilnius and Architecture at Warsaw University of Technology (graduated in 1951 with Romuald Gutt). In 1948 he was living in Paris, where he studied painting with Fernand Léger and architecture with Pierre Jeanneret. From 1955 he was a lecturer and since 1967 professor at the Academy of Fine Arts in Warsaw. His teaching and theories, especially the theory of Open Form, was developed in tandem with his wife - Zofia Garlińska - Hansen. Hansen had a huge impact on his students, among others, Grzegorz Kowalski, Zbigniew Frączkiewicz, Zofia Kulik, Elizabeth Cieślar, Emil Cieślar, Victor Gutta.