David Campbell is an acclaimed American arranger, composer, and conductor, recognized as one of the most influential orchestral arrangers in modern music. Born in Toronto and raised in the United States, Campbell has contributed to over 3,000 recordings across genres—pop, rock, film, classical, and beyond.

He is known for his sweeping string arrangements and his ability to elevate songs with emotional, cinematic depth. Over his decades-long career, he has worked with some of the world's biggest artists, including Adele, Beyoncé, Muse, Green Day, Evanescence, Michael Jackson, U2, Taylor Swift, and many more.

Campbell is also the father of Beck (Beck Hansen), further tying him to influential corners of alternative and rock music.

David Campbell has collaborated with ONE OK ROCK as an orchestral and strings arranger, contributing richly textured symphonic layers to their studio recordings.

He worked on Luxury Disease (2022), providing the album's orchestral arrangements, and returned for DETOX (2025), arranging the strings for This Can't Be Us. His signature cinematic style enhances the emotional intensity of the band's music, adding dramatic depth and elevating their rock sound into a more expansive, global production style.

Campbell's contributions underscore ONE OK ROCK's commitment to blending powerful rock elements with sophisticated, internationally minded orchestral arrangements.