She is a soloist and chamber musician who performs and records classical, jazz, film and popular music.

[9] She has performed duets with Andrea Bocelli, Sting, Michael Bublé,[1] Chris Botti,[8] Josh Groban, Rod Stewart, and Julio Iglesias.

With the Sonus Quartet, Campbell performed with Stevie Wonder at the Library of Congress,[11] recorded with Norah Jones for her album Little Broken Hearts, performed Crazy with Gnarls Barkley,[12] and recorded film scores such as The Curious Case of Benjamin Button, Transformers: Revenge of the Fallen, Spider-Man, and The Lone Ranger.

[11] Campbell is a founding member of Opus X, a classical musical foursome including Russian-Danish pianist Tanja Zapolski, British clarinetist Lone Madsen, and Japanese-American cellist Kristina Reiko Cooper.

Campbell was married to American businessman and attorney, John Miller, with whom she has two children, daughter Violet and son Quest.