Ziemilski married Olga Askenaze (b. 1894), the daughter of the vice-president of Lviv, president of the bar association, and a long-term chairman of the Jewish Community. They had one son, Andrzej, born in 1923. An older son died as an infant. His brother-in-law was the famed pianist Stefan Askenase (1896– 1985).
After graduating from medical school in 1921, Ziemilski became a prominent Lviv doctor. He sympathized with the Jewish assimilationist movement, and like many people from this circle, he changed his name in the 1920s. He preferred it to sound Polish, not German. Thus, Zimmels became Ziemilski. He also changed his Jewish first name, Baruch, to his Christian and Polish first name, Benedykt. The name change may have been caused by the reluctance of some of Lviv's inhabitants to consult doctors with Jewish-sounding names or by anti-Semitic sentiments among Polish academic circles. Being a practicing physician, he continued scientific research.
One of his medical practices was treating prisoners in the most important Polish prison at the time, located in the former monastery of the Holy Cross in the Świętokrzyskie Mountains. While working, he met a famous robber and spy, Sergiusz Piasecki, who entrusted him with the manuscript of his book. Ziemilski sent it to the well-known writer and publisher Melchior Wańkowicz, which led to his release. His novel, "Lover of the Great Bear," was a Polish bestseller in the interwar period.
In addition to his medical practice, Dr. Ziemilski did scientific work in a hospital to combat hypoglycemia and pulmonary diseases, especially tuberculosis. The German company Bayer became interested in the results of his research.
Dr. Ziemilski was friendly with other prominent medical figures in Poland during the interwar period. One was Dr. Marek Reichenstein, a pioneering medical doctor and art collector whose collections survived the war and are found in several Lviv museums. After Reichenstein died in 1932, Benedykt Ziemilski wrote an obituary for him in Polska Gazeta Lekarska, published in 1932. In part, he wrote the following in his friend's memory:
"His spirit was not confined to [medical] science. In an age when the average doctor is not moved by anything besides "interesting cases," he became fascinated with art: Art understood not as a mania of collecting curiosa, investing capital, or snobbishness. For him, it served as postulated by the ancient Greeks: it made him happy, it illuminated and ennobled him. He dealt mainly with graphic art, and by the end of his life, he became one of the best experts in Polish graphics."
See the full obituary here.
Ziemilski was a friend and companion on mountain climbing and ski trips with Antoni Gluziński, one of the most outstanding physicians in the history of Polish medicine and co-author of the first Polish handbook of internal medicine. 1907 Gluziński and Marek Reichenstein published a clinical description of plasmocytic leukemia, a first in world medical literature. This paper is cited even today in medical publications.
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