Haapalah / Aliyah Bet

Felix Aaron Theilhaber served with distinction as a doctor in the German Army during World War I.
In 1916, he wrote a book called Die Juden und der Weltkrieg (The Jews and the World War).
In 1918, he wrote Jüdische Flieger im Kriege (Jewish Flyers in the War) and revised it in 1924 as Jüdische Flieger im Weltkrieg (Jewish Flyers in the World War), in which he gave accounts of over one hundred Jewish soldiers who flew for Germany.

In 1933, the Gestapo arrested Felix Aaron Theilhaber for the research he was doing in the field of reproductive science.
After his release, he moved to Palestine, where he prospered and remained engaged in various social and humanitarian causes.
He founded Kupat Cholim Maccabea Health Services, which survives to this day.