David Richard Campbell (born 7 February 1948) is a Canadian-American arranger, composer, and conductor. He has composed and arranged music for many films, including North Country (2005), Brokeback Mountain (2005), August: Osage County (2013), Annie (2014), Foxcatcher (2014),  Rock of Ages (2012), Dreamgirls (2007),  and Joy (2015). He has also worked on over 450 gold and platinum albums by artists of a wide range of genres, including The Rolling Stones, Metallica, Radiohead, Evanescence, Rush, Beyoncé, Muse, Michael Jackson, Aaliyah, Ariana Grande, Harry Styles, Aerosmith, Garth Brooks, and various albums by his son Beck.
 Campbell was born in Toronto, Ontario. His father, D. Warren Campbell, was from Winnipeg, Manitoba, and was attending seminary in Toronto in order to become a Presbyterian minister. Campbell subsequently was assigned to a church in Pittsburgh, taking his family with him, before settling in Seattle. Campbell took up the violin at age 9. At age 12, he began venturing into orchestration, studying the works of Bartók, Schoenberg and Stravinsky.
 In the late 1960s, after studying at Manhattan School of Music, Campbell moved from New York to Los Angeles and began studying pop music. He studied the music of The Beatles, Leonard Cohen, and The Rolling Stones, and he played bluegrass music for crowds in line for movies in Westwood Village.
 At age 23, Campbell played on his first major album, Tapestry, by Carole King. This led to his first arranger role, for King's Rhymes and Reasons album. Campbell also played viola on recording sessions such as Marvin Gaye's "Let's Get It On" and Bill Withers' "Lean on Me".
Since then, he has gone on to arrange songs for such artists as Bob Dylan, The Rolling Stones, Bon Jovi, Dream Theater, Metallica, Paul McCartney, Radiohead, Jessie J, Juanes, Tim McGraw, Adele, Ricky Martin, Barbra Streisand, and Miley Cyrus.
 As a composer, David has written music for many films including Joy, Paper Tigers and Colombia: magia salvaje.  He has also arranged and orchestrated music for over 80 films including Annie (2014), Foxcatcher (2014), August: Osage County (2013), Rock of Ages (2012), Dreamgirls (2007), North Country (2005), and Brokeback Mountain (2005).  In 2010 he worked with Nigel Godrich on the score for Scott Pilgrim vs. The World. In 2016, he co-composed the 40-minute ballet Rules of the Game with Pharrell Williams.
 David has guest-conducted the Los Angeles Philharmonic and the Hollywood Bowl Orchestra at the Hollywood Bowl for Faith Hill, Death Cab for Cutie, Ray LaMontagne, Beck, Sheryl Crow, Willie Nelson, and The xx. He collaborated with Muse for the performance of "Survival", the official song of the London Olympics. He also collaborated with Beck for the Lincoln Motor Company ad campaign, "Hello, Again", which featured a live performance of Beck's "Sound and Vision" cover and included 167 live musicians playing simultaneously. In February 2009 Campbell arranged Radiohead's "15 Step" for the band's collaboration with the USC Marching Band at the 2009 Grammy Awards. He conducted the Los Angeles Philharmonic, as well as arranged and orchestrated the music for Beck's Song Reader concert at the Walt Disney Concert Hall, which featured many performers, including Childish Gambino, Juanes, Anne Hathaway, John C. Reilly, Jack Black, and Jarvis Cocker. He arranged and orchestrated for the Seattle Symphony and Pickwick's Sonic Evolution show on 6 June 2014.
 In 2003, he served as conductor of the Melbourne Symphony Orchestra during their one-night performance with Kiss, which was released on the album Kiss Symphony: Alive IV. During the concert, Campbell and the members of the orchestra wore the iconic Kiss makeup along with the members of the band.
 In 2018, for the LA Phil's 100th anniversary celebrations, David wrote arrangements for Chris Martin's and Corinne Bailey Rae's performances at Disney Hall, as well as Katy Perry's and Kali Uchis' performances at the Hollywood Bowl, all of which were conducted by Gustavo Dudamel.
 In 2019, he wrote arrangements for and conducted the LA Philharmonic, National Symphony Orchestra and Cincinnati Orchestra for Iron & Wine's 15th anniversary of Our Endless Numbered Days.
 He created the song arrangements, dance arrangements, underscoring and orchestrations for the Broadway musical Spider-Man: Turn Off the Dark.
 sources:
 Partial list of films that David Campbell's work contributed to.
 Campbell has two sons and one daughter with Bibbe Hansen: musician Beck Hansen, artist Channing Hansen, and Alyssa Suede.
 He is married to theatrical composer Pauline Frechette (aka Raven Kane).
 Campbell is a long-time practicing Scientologist.
 In 2012, he donated to Ron Paul's campaign in the United States Presidential election.