Marion Eleanor Zimmer Bradley was an American author of fantasy novels such as The Mists of Avalon and the Darkover series, often with a feminist outlook.

Bradleys first published novel-length work was Falcons of Narabedla, first published in the May 1957 issue of Other Worlds. When she was a child, Bradley stated that she enjoyed reading adventure fantasy authors such as Henry Kuttner, Edmond Hamilton, and Leigh Brackett, especially when they wrote about "the glint of strange suns on worlds that never were and never would be." Her first novel and much of her subsequent work show their influence strongly.

Early in her career, writing as Morgan Ives, Miriam Gardner, John Dexter, and Lee Chapman, Marion Zimmer Bradley produced several works outside the speculative fiction genre, including some gay and lesbian pulp fiction novels. For example, I Am a Lesbian was published in 1962. Though relatively tame by todays standards, they were considered pornographic when published, and for a long time she refused to disclose the titles she wrote under these pseudonyms.

Her 1958 story "The Planet Savers" introduced the planet of Darkover, which became the setting of a popular series by Bradley and other authors. The Darkover milieu may be considered as either fantasy with science fiction overtones or as science fiction with fantasy overtones, as Darkover is a lost earth colony where psi powers developed to an unusual degree. Bradley wrote many Darkover novels by herself, but in her later years collaborated with other authors for publication; her literary collaborators have continued the series since her death.

Bradley took an active role in science-fiction and fantasy fandom, promoting interaction with professional authors and publishers and making several important contributions to the subculture.

For many years, Bradley actively encouraged Darkover fan fiction and reprinted some of it in commercial Darkover anthologies, continuing to encourage submissions from unpublished authors, but this ended after a dispute with a fan over an unpublished Darkover novel of Bradleys that had similarities to some of the fans stories. As a result, the novel remained unpublished, and Bradley demanded the cessation of all Darkover fan fiction.

Bradley was also the editor of the long-running Sword and Sorceress anthology series, which encouraged submissions of fantasy stories featuring original and non-traditional heroines from young and upcoming authors. Although she particularly encouraged young female authors, she was not averse to including male authors in her anthologies. Mercedes Lackey was just one of many authors who first appeared in the anthologies. She also maintained a large family of writers at her home in Berkeley. Ms Bradley was editing the final Sword and Sorceress manuscript up until the week of her death in September of 1999.

Probably her most famous single novel is The Mists of Avalon. A retelling of the Camelot legend from the point of view of Morgaine and Gwenhwyfar, it grew into a series of books; like the Darkover series, the later novels are written with or by other authors and have continued to appear after Bradleys death.

In 2000, she was posthumously awarded the World Fantasy Award for Lifetime Achievement.

In 2014, Bradley was accused of sexual abuse by her daughter, Moira Greyland, who claims that she was molested from the age of 3 to 12. Greyland also claimed that she was not the only victim and that she was one of the people who reported her father, Walter H. Breen, for child molestation. In response to these allegations Bradleys publisher Victor Gollancz Ltd announced that they will donate all income from the sales of Bradleys e-books to the charity Save the Children.

- From Wikipedia