Kazimierz Bein sex or gender male
Kazimierz Bein (1872 – June 15, 1959), often referred to by his pseudonym Kabe,     was a Polish ophthalmologist, the founder and sometime director of the Warsaw Ophthalmic Institute (Warszawski Instytut Oftalmiczny).
He was also, for a time, a prominent Esperanto author, translator and activist, until in 1911 he suddenly, without explanation, abandoned the Esperanto movement.  Bein became at least as well known for his involvement with Esperanto as for his medical accomplishments, and as much for the manner in which he left the Esperanto movement as for what he had accomplished within it.Life
As a young man, Bein participated in the Polish movement for independence from Russia, for which he was exiled for several years; thus he was forced to finish his medical training in Kazan. Bein authored many technical books and articles, and founded the Warsaw Ophthalmic Institute and the Polish Ophthalmological Society. He was also a noted amateur photographer.
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