Aaron Copland (/ˌærən ˈkoʊplənd/; November 14, 1900 –December 2, 1990) was an American composer, composition teacher, writer, and later in his career a conductor of his own and other American music. Instrumental in forging a distinctly American style of composition, in his later years he was often referred to as "the Dean of American Composers" and is best known to the public for the works he wrote in the 1930s and 1940s in a deliberately accessible style often referred to as "populist" and which the composer labeled his "vernacular" style.