Nikolai Trubetzkoy (1890–1938) was a Russian émigré scholar who settled in Austria in 1922, serving as Head of Slavic Linguistics at the University of Vienna and participating in the Prague Linguistics Circle. Trubetzkoy wrote nearly 150 works on phonology, prosody, comparative linguistics, linguistic geography, folklore, literature, history, and political theory. His posthumously published Grundzüge der Phonologie (Principles of Phonology) is regarded as one of the key works in the science of phonology. Here Trubetzkoy, influenced by Saussurean insights, elaborated on the linguistic function of speech sounds, the role of oppositions, and markedness. He was also concerned with developing universal laws of phonological patterning, and his work involves the discussion of a wide variety of languages. The Grundzüge became the classic statement of part of Prague School linguistics, which later influenced both European and American linguistics, notably in Chomsky and Halle’s The Sound Pattern of English. Less well-known are Trubetzkoy’s historical and political works on Eurasia and Eurasianism. In Europe and Mankind, Trubetzkoy argued that Russia was not culturally part of Europe but should evolve to form its own political systems based on its geography and common legacy with the peoples of Eurasia.