James Roy Horner (August 14, 1953 – June 22, 2015) was an American composer, conductor, and orchestrator of film scores. He was known for the integration of choral and electronic elements, and for his frequent use of motifs associated with Celtic music.
Throughout the 1980s, 1990s and 2000s, Horner wrote orchestral scores for family films (particularly those produced by Steven Spielberg's Amblin Entertainment), with credits for Casper.