A production designer, he works for the theatre, film and television. He graduated from the Academy of Fine Arts in Katowice and studied at the Faculty of Scenography of the Academy of Fine Arts in Kraków. He runs the Scenography Studio at the AFA Katowice Faculty of Art together with Katarzyna Sobańska. He is Head of the Chair of Film and Television Production Design at the Faculty of Scenography of the Academy of Fine Arts in Warsaw. His artistic activities include numerous stage and film realisations. His successful cooperation with Katarzyna Sobańska has resulted in the 2010 Gold Mask award for their scenography for the Oliver! musical, directed by M. Piekorz at Teatr Rozrywki in Chorzów. He has also cooperated with Grzegorz Jarzyna, Małgorzata Szumowska, Przemysław Wojcieszek and Ingmar Villquist. Together with Katarzyna Sobańska, they received the art direction award for the Lech Majewski film The Mill and the Cross at the Polish Film Festival in Gdynia in 2011, and the Polish Film Award Eagle for the same film. Marceli Sławiński has also cooperated with Agnieszka Holland (receiving art direction award for the film In Darkness at the Polish Film Festival in Gdynia in 2012) and Paweł Pawlikowski (PFF 2013 art direction award for Ida).
He and Katarzyna Sobańska are also the authors of production design for the award-winning films Jesteś Bogiem directed by Leszek Dawid, and Cold War directed by Pawlikowski.