Nikolai Dahl
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In this name that follows Eastern Slavic naming customs, the patronymic is Vladimirovich and the family name is Dahl.
Nikolai Vladimirovich Dahl, often called Nicolai Dahl (Russian: Николай Владимирович Даль) (July 17, 1860 – 1939) was a Russian physician.[1] He is most notable for his successful treatment of the composer Sergei Rachmaninoff, who was suffering a creative block after the disastrous premiere of his First Symphony. Among his other notable patients were Chaliapin, Scriabin, Stanislavsky, and many others.