Nederlander was born Gladys Lenore Blum in New York City, to Gaston Blum, an immigrant from England, and Sherry, an immigrant from Romania. Her father worked in advertising. Her family moved to Chicago when she was a child and after the death of her father, her mother moved the family to southern California.
Her first job was working on the staff of the 1940s radio game show Queen for a Day. In the early 1960s, after two children and a divorce from songwriter Fred Stryker, she ran a clothing store Palm Springs, California and also worked at a local radio station interviewing celebrities. Between 1976 and 1993 she produced nine Broadway shows including the 1977 adaption of Caesar and Cleopatra with Rex Harrison and Elizabeth Ashley.
The 1980 revival of West Side Story written by Stephen Sondheim, Arthur Laurents and Leonard Bernstein.
The 1992 play, Death and the Maiden written by Chilean playwright Ariel Dorfman and starring Gene Hackman, Glenn Close, and Richard Dreyfus. And the 1993 musical adaptation of Neil Simon’s Goodbye Girl with Martin Short and Bernadette Peters.
In 1982, she became executive producer for Nederlander Television and Film Productions which produced made-for-television movies including A Case of Libel with Edward Asner and Daniel J. Travanti and Intimate Strangers starring Stacey Keach. She also produced a series of 14 one-act plays by for the Arts & Entertainment Network.
In 1990, she produced the film Orpheus Descending starring Vanessa Redgrave and directed by Peter Hall based on a Tennessee Williams" play.
In 1963, after marrying the founder of Decca Records and president of Universal Pictures, Milton Rackmil, she worked with American theatrical producer Roger L. Stevens at the Kennedy Center for the Performing Arts (which Stevens founded). In 1963, she married the co-founder of Decca Records and the president of Universal Pictures, Milton Rackmil (the former husband of American actress and singer Vivian Blaine).
