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 Russia, he wrote his first nine novels in Russian (1926–1938) while living in Berlin. He achieved international acclaim and prominence after moving to the United States and beginning to write in English. Nabokov became an American citizen in 1945, but he and his wife returned to Europe in 1961, settling in Montreux, Switzerland.