Carr was born Charmian Farnon in Chicago, Illinois, the second child of vaudeville actress Rita Oehmen and musician Brian Farnon. She had never had a singing lesson and had never tried to act before she was signed to be in The Sound of Music. She was working for a doctor studying at San Fernando Valley State College when she sustained audition for a role in The Sound of Music. She won the role and had a very happy experience. “Filming in Salzburg, Austria, was like being in a fairy tale,” she said. Later, at owner of an interior design firm, Charmian Carr Designs, in Encino, California, she had between clients some other cast members from the film, the screenwriter for The Sound of Music and even Michael Jackson. She married a dentist, Jay Brent, and they had two daughters.
Carr co-wrote 2 books: “Forever Liesl” which details her experiences making the movie and living her life as “Liesl” and “Letters to Liesl” which was inspired by mail she’d received from thousands of her fans.