In 1919 cellist Friedrich Wilhelm Ludwig Grützmacher (1866–1919), the nephew of Friedrich Wilhelm Grützmacher, died, and Klengel recommended Feuermann for Grützmacher's position at the Gürzenich Conservatory in Cologne.
En 1919 o chelista Friedrich Wilhelm Ludwig Grützmacher (1866-1919), o sobriño Friedrich Wilhelm Grützmacher morreu, e Klengel recomendou a Feuermann para o posto de Grützmacher no Conservatorio de Gürzenich en Colonia.