b. Vienna, April 10, 1835, d. Vienna, May 8, 1919; thanks to him the company of his father Ignaz Boesendorfer became world famous. Important figure and patron in Vienna´s music scene. Built the Boesendorfer-Saal. From 1878 member of the board of directors of the Gesellschaft der Musikfreunde in Wien (Society of Friends of Music). In 1909 he sold the piano factory to C. Hutterstrasser.