The Nebula Awards are voted on, and presented by, active members of the Science Fiction and Fantasy Writers of America, Inc. Founded as the Science Fiction Writers of America in 1965 by Damon Knight, the organization began with a charter membership of 78 writers; it now has over 1,000 members, among them most of the leading writers of science fiction and fantasy.
The
Grand Master Award is given to a living author for a lifetime's achievement in science fiction and/or fantasy. Nominations for the Grand Master Award are made by the president of SFWA; the award is given upon approval of a majority of the SFWA officers.
The Grand Masters, and the years in which they were honored, are Robert A. Heinlein (1974), Jack Williamson (1975), Clifford D. Simak (1976), L. Sprague de Camp (1978), Fritz Leiber (1981),
Andre Norton (1983), Arthur C. Clarke (1985), Isaac Asimov (1986), Alfred Bester (1987), Ray Bradbury (1988), Lester Del Rey (1990), Frederik Pohl (1992), Damon Knight (1994), A.E. Van Vogt (1995), Jack Vance (1996), Poul Anderson (1997).