Marion Zimmer was born in Albany, New York, on June 3, 1930, and married Robert Alden Bradley in 1949. Mrs. Bradley received her B.A. in 1964 from Hardin Simmons University in Abilene, Texas, then did graduate work at the University of California, Berkeley, from 1965-1967.

She wrote everything from science fiction to Gothics, but is probably best known for her Darkover novels and her Arthurian fantasy novel THE MISTS OF AVALON. In addition to her novels, Mrs. Bradley edited many magazines, amateur and professional, including Marion Zimmer Bradley's FANTASY Magazine, which she started in 1988. She also edited an annual anthology called SWORD AND SORCERESS.

She died in Berkeley, California on September 25, 1999, four days after suffering a major heart attack.