Between 1919 and 1923, he was principal cellist in Bochum; and until 1927 soloist of the Vienna Symphony Orchestra.
At the same time, he became more involved in his activities as a soloist, and as a chamber musician: he played with his brothers Fritz and Adolf.
In addition, he was a member of the Duo Wührer, with violinist Karl Doktor (1885-1949)[1] and pianist Friedrich Wührer; a member of the Busch-Serkin trio with his brother Adolf in 1930 (until 1952 when Adolf died),[2] he was the cellist of the Busch Quartet succeeding Paul Grümmer.
[3] In 1940, he moved to the United States[3] where he was a member of the Adolf Busch's Chamber Orchestra and co-founder of the Marlboro School of Music.
[4] In 1954, he was appointed professor at the University of Miami in Coral Gables Florida.