Leonard Bernstein (/ˈbɜrnstaɪn/; August 25, 1918 – October 14, 1990) was an American composer, conductor, author, music lecturer, and pianist. He was among the first conductors born and educated in the United States of America to receive worldwide acclaim. According to music critic Donal Henahan, he was "one of the most prodigiously talented and successful musicians in American history."

His fame derived from his long tenure as the music director of the New York Philharmonic, from his conducting of concerts with most of the world's leading orchestras, and from his music for West Side Story, Peter Pan, Candide, Wonderful Town, On the Town and his own Mass.