Vladimir Vladimirovich Nabokov (Russian: Владимир Владимирович Набоков [vlɐˈdʲimʲɪr vlɐˈdʲimʲɪrəvʲɪtɕ nɐˈbokəf] (listen); 22 April [O.S. 10 April] 1899 – 2 July 1977), also known by the pen name Vladimir Sirin (Владимир Сирин), was a Russian-American novelist, poet, translator, and entomologist. Born in Imperial Russia in 1899, Nabokov wrote his first nine novels in Russian (1926–1938) while living in Berlin, where he met his wife. He achieved international acclaim and prominence after moving to the United States, where he began writing in English. Nabokov became an American citizen in 1945 and lived mostly on the East Coast before returning to Europe in 1961, where he settled in Montreux, Switzerland.