After fleeing Germany, Ziemer returned to his wife Edna's hometown of Lake City, Minnesota.
Ziemer wrote a couple of notable books about Nazi society: Education for Death, which inspired the eponymous Disney short, and, more directly, Edward Dmytryk's movie Hitler's Children, as well as, along with his daughter Patricia, Two Thousand and Ten Days of Hitler.
At the Nuremberg Trials, an affidavit by Ziemer (an excerpt of one of his books), dealing with Nazi society in general and the education of youth in particular, was presented by the prosecutors.
According to Reichsjugendführer Baldur von Schirach, this writing contained untruth and had "more importance as propaganda than it tends to be objective" and was "clearly inflammatory".
[3] Ziemer, who lived in California but summered in Lake City, kept busy as a writer of stories and articles and author of screenplays, contributing to the Saturday Evening Post and other popular magazines of the mid-20th century.