Tschudi-Madsen graduated in 1950 from the University of Oslo with a thesis in art history on romantic architecture. In 1952-1953 he worked as a British Councilscholar in London. Professor Nikolaus Pevsner was one of his tutors and Tschudi-Madsen received his Ph.D. with the dissertation «Sources of Art Nouveau».
Career
Tschudi-Madsen worked as an antiquarian at the Directorate for Cultural Heritage in Norway from 1959. He was active for the preservation of Norwegian wooden buildings during the European Architectural Heritage Year campaign that was organized in 1975. He was also one of the pioneers of rediscovering the qualities of the compact Art Nouveau townscape of Ålesund, Norway. He was strongly engaged in international cultural heritage through the association ICOMOS where he held a central position, and through UNESCOs work with World Heritage Sites. Under his leadership Urnes stave church and Bryggen in Bergen were listed, in 1979. For a period he was also vice president of the UNESCO World Heritage Committee. Tschudi-Madsen had a large academic production and was well known for his abilities as communicator. He was adviser for the restoration of the Royal Palace, Oslo, Supreme Court of Norway and Den Nationale Scene in Bergen. For a long period he was the president of Friends of Akershus Fortress. He was a great supporter for establishing an Art Nouveau Interpretation centre, Jugendstilsenteret in Ålesund, Norway. Between 1999-2003 he also worked as adviser for Jugendstilsenteret. Tschudi-Madsen was member of the Norwegian Academy of Science and Letters and Honorary Member of the Society for the Preservation of Ancient Norwegian Monuments and Honorary Member of ICOMOS. He was Knight, First Class, of the Royal Norwegian Order of St. Olav, Commander of the Dutch Order of Oranje-Nassau, Knight of the Belgian Order of Leopold II and Commander of the Royal Norwegian Order of St. Olav.
Selected bibliography
The Perception of Art Nouveau, Iconography and Historiography / La perception de l'Art nouveau, iconographie et Historiographie. Art Nouveau in Progress / Art nouveau en projet. Proceedings of the colloquium / Actes du colloque, Wien 24-25/10/2002. Réseau Art Nouveau Network, Brussels 2003.
The Art Nouveau style 2002
The British ambassador's residence in Oslo 2001
Norway and Conservation Aspect. Vern og Virke 1983, Oslo 1984
Principles in Practice. Reflecting on Conservation of Wooden Architecture. ICOMOS Information, Napoli, Paris 1984
Art Nouveau. Japanese Translation by Bijutu Koron-sha. Tokyo 1983
Henrik Bull cop.1983
Art Nouveau 1982
Restoration and anti-restoration. Oslo 1981
Introduction. Luce Hinsch: ICOMOS 1965-1980. Oslo 1980
Ansprache des Norwegischen Reichantiquars Stephan Tschudi-Madsen. Verleihung des Europa-Preises und der Europa-Goldmedaille für Denkmalpflege 1979. Hamburg 1979
Art Nouveau. Warszawa 1978
Art Nouveau. Bucuresti 1977
Art Nouveau.. Warszawa 1977
Akershus Schloss. Le Château d'Akershus. Oslo 1977