In 1902, at the Mainz Festival, Weingartner conducted all nine Beethoven symphonies. From 1907 to 1910 he was the Director of the Vienna Hofoper, succeeding Gustav Mahler; he retained the conductorship of the Vienna Philharmonic until 1927. From 1912 he was again Kapellmeister in Hamburg, but resigned in 1914 and went to Darmstadt as general music director while also often conducting in the U.S. for the Boston Opera Company between 1912–1914. In 1919–20, he was chief conductor of the Vienna Volksoper. In 1920, he became a professor at the Franz Liszt Academy in Budapest. From 1927 to 1934 he was music director of the Basel symphony orchestra. He made many outstanding Beethoven and Brahms symphony recordings in Vienna and London between the mid-1920s and his last recording session with the London Symphony, including an electrifying Brahms Second to complete the historic Beethoven-Brahms symphony cycle he began in the 1920s (see below), on February 29, 1940. He gave his last concert in London that year and died in Winterthur, Switzerland two years later.