Sergei Vasilievich Rachmaninov (Russian: Сергей Васильевич Рахманинов, Sergej Vasil'evič Rahmaninov, April 1, 1873 (N.S.) or March 20, 1873 (O.S.) – March 28, 1943) was a Russian composer, pianist, and conductor. ("Sergei Rachmaninoff" was the spelling the composer himself used while living in the West throughout the latter half of his life, including when he became a United States citizen. However, alternative transliterations of his name include Sergey or Serge, and Rachmaninov, Rachmaninow, Rakhmaninov or Rakhmaninoff.)