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Häßler was a professor at the university of Jena. Under the Nazis, he was member of the "Office for Racial Policy" ("Rassenpolitisches Amt") in Leipzig. In 1939, he co-authored a book on child care, in which he called Jews "rootless parasites" ("wurzelloses Parasitentum").
In 2004, Häßler was one of 22 members of the medical profession to sign a declaration of solidarity for Dr Rosemarie Albrecht, a German doctor accused of having conducted medical experiments in the Nazi era. Häßler was a member of the "Sängerschaft zu St Pauli" in Jena, a student fraternity. He died at the age of 106.
- Zintl, Felix; Dietlinde Fuchs (February 14, 2006). "Nachruf auf Prof. Dr. Erich Häßler". Personalia (in German). Deutsche Gesellschaft für Kinder- und Jugendmedizin e.V. Retrieved 2010-10-17.
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