- In "Le Basalte Bleu", Knittel speculated that the origins of the Cinderella fairy tale came from the story of Egyptian Queen Nitocris, who lost a golden sandal that was later found by pharaoh.
- Founded the Cairo Institute of Oriental Psychology.
- Maintained a home in Egypt for many years.
- Remembered for his 1930s novels "El Hakim" and "Via Mala".
- Was the son of missionaries.
- Swiss playwright and author.
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