James Roy Horner is an American composer, conductor, and orchestrator of film music. He is famous for the integration of choral and electronic elements in many of his film scores, and for frequent use of Celtic musical elements. Horner has scored over 100 films including those for Aliens, An American Tail and its sequel, Field of Dreams, Glory, Legends of the Fall, Braveheart, Apollo 13, Titanic, A Beautiful Mind, House of Sand and Fog, and Avatar. His score for Titanic is the best selling orchestral film soundtrack of all time. He has also collaborated multiple times with directors Mel Gibson, Ron Howard and Jean-Jacques Annaud. Horner has won two Academy Awards, two Golden Globe Awards, three Satellite Awards, three Saturn Awards, and has been nominated for three British Academy Film Awards.

James Roy Horner was born on August 14, 1953 in Los Angeles as a son of Austrian Jewish immigrants Joan and Harry Horner, who was a production designer, set designer and occasional film director. Horner started playing piano at the age of five. His early years were spent in London, where he attended the Royal College of Music. He subsequently attended Verde Valley High School in Sedona, Arizona. He received his bachelor's degree in music from the University of Southern California. After he earned a master's degree he started working on his doctorate at the University of California, Los Angeles, where he studied with Paul Chihara, among others. After several scoring assignments with the American Film Institute in the 1970s, he finished teaching a course in music theory at UCLA and turned to film scoring.

Talking about his professional journey, his first major film score was for the 1979 film The Lady in Red. After that he began his career scoring films by working for B film director and producer Roger Corman. His first composer credit was for Corman's Battle Beyond the Stars. His works steadily gained notice in Hollywood, which led him to take on larger projects. Horner made a breakthrough in 1982, when he had the chance to score for Star Trek II: The Wrath of Khan, establishing himself as a mainstream composer. The film's director Nicholas Meyer famously quipped that he had been hired because the studio couldn't afford to use the first film's composer Jerry Goldsmith again, but by the time Meyer returned to the franchise with Star Trek VI: The Undiscovered Country, he found that he couldn't afford Horner. Horner continued composing music for high-profile releases during the 1980s, including 48 Hrs. (1982), Krull (1983), Star Trek III: The Search for Spock (1984), Commando (1985), Cocoon (1985), Aliens (1986), *batteries not included (1987), Willow (1988), Glory and Field of Dreams (both 1989). Aliens earned Horner his first Academy Award nomination. He has since been nominated an additional nine times. Horner's scores have been sampled in trailers for other films. The climax of the track Bishop's Countdown from his score for Aliens ranks fifth in the most commonly used soundtrack cues for film trailers. Throughout the 1980s and early 1990s and the 2000s, Horner also wrote orchestral scores for children's films (particularly those produced by Amblin Entertainment), with credits for An American Tail (1986), The Land Before Time (1988), An American Tail: Fievel Goes West (1991), We're Back! A Dinosaur's Story (1993), and Casper, Jumanji, and Balto (all from 1995) and 'How the Grinch stole Christmas (2000). He also composed the motif for the 1990-1997 Universal Pictures logo.

Talking about his personal life, he has been married to Sarah Horner and he has fathered two daughters as well. Till the date there has no any issue with his married life, as the couple is spending happy life together.