In 1903, with financial support from the patron François Franck, Mortelmans founded the Maatschappij der Nieuwe Concerten ("Society of New Concerts") in Antwerp, which attracted notable guest conductors and artists such as Gustav Mahler, Siegfried Wagner, Hans Richter, Richard Strauss, Sergei Rachmaninoff, Pablo de Sarasate, Jacques Thibaud, Pablo Casals, and Fritz Kreisler.
Siegfried Wagner (1869-1930), German composer, conductor, and opera director, the son of Richard Wagner
In 1892 he undertook a trip to Asia with a friend, the English composer Clement Harris.
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