Marni Nixon's career includes Opera, (Seattle, San Francisco, Ford Foundation TV Opera Cameos), Chamber and Symphony, Oratorio soloist and Grammy Nominated recordgs both Popular and Classical (Boulez, Villa-Lobos, Ives, Schoenberg, Stravinsky, Copland) including conductors Von Beinum, Wallenstein, Previn, Mehta, Stravinksy, Stokowski, Mauceri, Slatkin and Bernstein.

Awards include Four Emmys for Best Actress on her children's TV show called Boomerang and two Gold records for Songs for Mary Poppins and Mulan (voice of Grandma Fa), 2 Classical Grammy Nominations...Broadway includes Heidi Schiller in Sondheim's Follies, and originating the roles of Sadie McKibben in Opal, and Edna in Taking My Turn, and Aunt Kate in James Joyce's the Dead also on tour in LA and the Kennedy Center in Washington, DC. In Regional and Off-Broadway her roles have included Nurse in Shakespeare's Romeo & Juliet, Fraulien Schneider in Cabaret, and recently Eunice Miller in Kander and Ebb's "70, Girls, 70". In the recent Premiere of Richard Wargo's Opera Ballymore at Skylight Opera in Milwaukee, Wisconsin (taped for PBS) she originated the role of Mrs. Wilson.

TV includes Boomerang (Children's show in rerun for 25 years, awarded 26 Emmy Awards and 4 personal Emmy's for Best Actress); The Mothers in-Law; Law & Order: Special Victims Unit; I've Got a Secret; To Tell the Truth; frequent American Variety shows such as the Merv Griffin Show, Hollywood Palace, Today show, Tonight show and The Harry Secombe Show in the British Isles, The Best of Both Worlds (her own Special) on BBC and ITV. Formerly a frequent guest and side-kick for Liberace and Victor Borge, her national tours include her show Marni Nixon: The Voice of Hollywood. Recently she has been seen in many "the-making-of" documentaries. Film roles include Aunt Alice in I Think I Do; Sister Sophia in The Sound of Music.

A much sought after judge of Metropolitan Opera Auditions, National Association of Teachers of Singing, etc. Miss Nixon presents Master Classes in Colleges and Universities and teaches privately throughout the USA. Miss Nixon is the singing voice of Deborah Kerr, Natalie Wood and Audrey Hepburn in the Motion Pictures and on the Soundtracks of The King and I, An Affair to Remember, West Side Story, and My Fair Lady.

Recently, Marni was the recipient of the George Peabody Award 2012 for "Outstanding Contributions to American Music".