- In 1916, he was an extra on different stages in Vienna but was soon recruited into the army for World War I. During his military service, he was held prisoner for a year.
- After his first marriage ended, Diessl lived with actress Camilla Horn for several years.
- Diessl died in 1948 following two strokes.
- After World War I, Diessl started training as a stage designer but left to pursue a professional career in acting. Meanwhile, he played for a touring company and in 1921 had his first fixed engagement at the Neue Wiener Bühne. That same year he appeared in his film debut, G. W. Pabst's Im Banne der Kralle (1921).
- One of his most famous roles was in the German 1944-45 propaganda epic Kolberg designed to strengthen peoples' morale at the time of great military reverses.
- He logged a large number of films, usually romantic comedies, among them several in war-time Italy.
- The actor Gustav Diessl attended courses in painting and art where he already demonstrated his artistic ambitions.
- His son Peter was born in 1941. In October 1945 his second son Fritz was born. After Diessl and his wife had died, the orphaned children went into care of Curt Goetz and Valerie von Martens, who took them in 1949 to Switzerland. In 1954 the boys were adopted by Clifford Curzon, an English professor and his American wife Lucille Curzon-Wallace, a heir to a pharmaceutical factory.
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