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. In literary circles, she is often referred to by her initials, "MZB," a nickname reinforced by her friend and editor, Donald A. Wollheim. Wikipedia
The definitive Wikipedia entry for Marion Zimmer Bradley. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Marion_Zimmer_Bradley
