Born on 3 August 1865 in Prostějov, Moravia, Austrian Empire, Max Mandl-Maldenau managed branches of a weaving mill and leather wholesaler in Vienna and Königinhof an der Elbe (now Dvůr Králové nad Labem, Czech Republic).
[3] In 1953, their son-in-law Richard L. Winton-Wiener searched unsuccessfully for the collection at institutions like Dorotheum and Galerie Welz.
In 1962, their children filed claims with the Fonds zur Abgeltung von Vermögensverlusten [de].
Following research under the 1998 Art Restitution Act, and a recommendation by the Austrian panel in 2009,[4] the Österreichische Galerie returned Johann Peter Krafft's Male Portrait in 2011.
[3] The Mandl-Mandenau heirs have registered search request for five artworks that were seized under the Nazis on the German Lost Art Foundation Database.