- Profession: Composer, councillor, choral conductor, hofrat.
- Relation to Mahler: Friend and promotor of the compositions by Gustav Mahler.
- Correspondence with Mahler: Yes.
- Born: 11-02-1862 Vienna, Neustadt, Austria.
- Died: 24-09-1927 in Maria Saal, Klagenfurt, Austria. Aged 65.
- Buried: Unknown.
Julius Weis Ritter von Ostborn, Julius von Weis-Ostborn. Financial officer and member of the Graz finance department, was also founder of the Deutscher Akademischer Gesangverein "Gothina' who gave the first Graz performance, in March 1910 of Das Klagende Lied. He was a friend of Gustav Mahler.