Mrs. Rosenfield was 78. The cause of death was cancer.
With her husband, Maurice, a corporate and civil liberties lawyer, Mrs. Rosenfield launched a production company in the early 1970s, with the sleeper hit, "Bang the Drum Slowly." Mrs. Rosenfield herself spotted the virtually unknown Robert De Niro and cast him in one of the leads, opposite Michael Moriarty and Vincent Gardenia.
Mrs. Rosenfield made her Broadway debut in 1980 with the Tony Award-winning musical Barnum, starring Jim Dale and Glenn Close. Michael Crawford starred in the 1981 London production. Mrs. Rosenfield's stage version of Singin' in the Rain was initially produced in London in 1984 (with Tommy Steele) and on Broadway in 1985 (staged by Twyla Tharp). A 2000 revival of Singin' in the Rain at the National Theatre in London won the Olivier Award for Outstanding Production, and the 2001 Paris production won the equivalent Molière Award.
She also coproduced the 1983 Jessica Tandy production of The Glass Menagerie (directed by John Dexter); Athol Fugard's The Road to Mecca; and the award-winning 1990 musical Falsettoland (by William Finn and James Lapine).
Mrs. Rosenfield is survived by her husband; two sons, Andrew and James; and four grandchildren.