Ms. L'Engle was born in 1918 in New York City. She wrote her first book, The Small Rain, while touring with Eva Le Gallienne in Uncle Harry. She met Hugh Franklin, to whom she was married until his death in 1986, while they were rehearsing The Cherry Orchard, and they were married on tour during a run of The Joyous Season, starring Ethel Barrymore.
Ms. L'Engle retired from the stage after her marriage, and the Franklins moved to northwest Connecticut and opened a general store. After a decade in Connecticut, the family returned to New York.
After splitting her time between New York City and Connecticut and acting as the librarian and writer-in-residence at the Cathedral of St. John the Divine, Madeleine L'Engle died on September 7, 2007 at the age of 88.