Question: What was the nationality of the student of Jan Baudouin de Courtenay and member of the Kazan School? 
Sentence (from "Nikolai Trubetzkoy"): Prince Nikolai Sergeyevich Trubetzkoy (also Troubetskoy; Russian: Никола́й Серге́евич Трубецко́й; Moscow, April 16, 1890 – Vienna, June 25, 1938) was a Russian linguist and historian whose teachings formed a nucleus of the Prague School of structural linguistics.
Relevant evidence: Yes