Horbowskis served several times on the jury of the Queen Elisabeth Music Competition in Brussels, one of the world's most important music competitions.
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After Kreutzer was driven from his teaching post by the Nazi government in 1933 and emigrated to Japan, Horbowski took over the piano class at the Berlin Conservatory.
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At the age of 18, he received a scholarship to the Berlin Conservatory, where he studied alongside Rachmaninov student Vladimir Horbowski and Winfried Wolf.