Marian Nketiah comes from Duisburg and studied architecture at the Technical University of Berlin. After graduating, he worked as an assistant stage designer at the Maxim Gorki Theater Berlin, the Staatsoper unter den Linden, the Salzburg Festival and the Zurich Opera. In the process, he worked with various stage and costume designers, such as Reinhard von der Thannen, Jens Kilian and Ben Baur.
Marian Nketiah has been working as a freelance stage and costume designer since 2017, including at Ballhaus Naunynstraße Berlin in the production Walking Large (2017) directed by Atif Mohammed Nor Hussein, at the Stadttheater Duisburg and at the HfMT Hamburg.