Juliusz then returned to the Warsaw Conservatory to study theory under Zygmunt Noskowski, and graduated with a gold medal in 1901.
[2] The Wertheims maintained an important salon in Warsaw, and the young Arthur Rubinstein became drawn into it during the first decade of the 20th century, as were Josef Hofmann and Paweł Kochański.
Rubinstein made numerous sexual conquests among women who had initially set their sights on the homosexual (and thus unattainable) Wertheim.
[5] Despite his musical understanding, Wertheim possessed a flawed and unreliable piano technique (as Zbigniew Drzewiecki, among others, observed): however he was able to encourage several young pianists, including Roman Jasiński, Bolesław Kon and Aleksander Kagan.
[6] Juliusz Wertheim died of a heart attack while conducting Wagner's Meistersinger Prelude with the Warsaw Philharmonic Orchestra in a broadcast concert, on 6 May 1928.