1965 he lectured at the Linz Kunstschule, and in 1966 he participated in a conference for visual communication organized at the German Universität zu Köln. He was invited to conduct a course for graphic designers at the Centre for Creative Enterprise near Moscow in 1968. He lectured at the German Westfälische Wilhelms-Universität Münster and at the Association of Russian Artists in Moscow, and lectured on teaching graphic design in Vienna and Linz in 1974. Mroszczak co-founded the periodical Projekt (Design) and was its editor from 1956 until 1966. He was Vice Chairman of ZPAP's Chief Artistic Committee, and was co-founder and Chairman of the Warsaw International Poster Biennial Organizational Committee from 1966 to his death in 1975. He was a member of the Committee for Packaging, the Council for Culture and Artistic Higher Education at the Art and Culture Ministry, and the Fine Arts Council. He served as Chairman of the Artistic Committee of the Wilanów Poster Museum, and was both Presidium Member of the Prime Minister's Council on Industrial Aesthetics and Design, and Chairman of the Fine Arts Section of the State Awards Committee. His interests included poster design, the art of exhibition, and functional graphic design. He designed pavilions at various international expositions and fairs, including Poznań, Paris, Milan, Barcelona, Leipzig, Stockholm, Helsinki, Izmir, Bari, Brussels, and Vienna. He was Chief Designer of the Polish Industry Exhibition in Moscow in 1959; and in 1961 he co-designed the Polish pavilion at the international work safety exposition “Italia ‘61” in Turin. Mroszczak became a member of AGI in 1950 and served as Chairman of the organization's Polish Section from 1966 to 1974. In 1968–70, he was Vice Chairman of ICOGRADA. He was also an honorary member of the Dutch Graphic Artists Association (GVN) and of the Academia Nazionale de Belli Arte in Parma. Mroszczak died on September 19, 1975, in Warsaw. Distinctions 1947 – Golden Cross of Democratic Hungary 1952 – Golden Cross of Merit 1959 – Officer's Cross of the Order of Polonia Restituta 1975 – Commander's Cross of the Order of Polonia Restituta Individual expositions 1962 - Katowice 1964 - Vienna, Galerie in der Biberstrasse 1968 - London 1971 - Essen, Deutsches Plakat Museum 1972 - West Berlin, Galerie Warschau 1972 - Moscow 1973 - Leningrad 1973 - Warsaw, Dom Artysty Plastyka 1976 - Warsaw, Galeria Zapiecek (posthumous) 1978 - Essen, Deutsches Plakat Museum 1985 - Warsaw, Kordegarda