In 1927–1932 he was occupied as music critic with the Berlin Financial Newspaper. In 1933 and 1934 he was on the editorial staff (Munzinger speaks of him as "Editor Publisher") of the Journal for New Music called "Melos" and for the successor-journal "Neues Musikblatt". In 1934–1938 he worked for the "Berliner Tageblatt", for which, under the pseudonym Karl Frahm, he also wrote cookery recipes and a Cookery Book. In 1935 he was denounced as a 'Music-Bolshevist' by the Militant League for German Culture. When Strobel made his second marriage to a woman (Hilda Levy) designated a 'Jewess' by the racialist Nuremberg Laws, he acquired a Special Permit for Publication from the Nazi regime. From 1 February 1939 he worked for the Deutsche Allgemeine Zeitung, from April 1939 as Foreign Correspondent in Paris, and during the period of the German occupation. In 1940 he published a biography of Claude Debussy in the Zürich "Atlantis Press" (founded by Martin Hürlimann). Under a pseudonym he also wrote for a supplement of Goebbels's newspaper "Das Reich". Strobel, who at first was called up for the military reserve, was drafted into the "Landsturm" after the Allied Invasion of northern France in Summer 1944, and became a prisoner of war in the Liberation of Paris.