Along with the regular yearly Nebula Awards, the SFWA (Science Fiction Writers of America) awards (though not every year) a lifetime achievement award known as the Nebula Grandmaster award. Past winners:

1974 Robert A. Heinlein
1975 Jack Williamson
1976 Clifford D. Simak
1978 L. Sprague de Camp
1981 Fritz Leiber
1983 Andre Norton
1985 Arthur C. Clarke
1986 Isaac Asimov
1987 Alfred Bester
1988 Ray Bradbury
1990 Lester del Rey
1992 Frederik Pohl
1994 Damon Knight
1995 A. E. Van Vogt
1996 Jack Vance
1997 Poul Anderson
1998 Hal Clement
1999 Brian W. Aldiss
2000 Philip José Farmer
2002 Ursula K. Le Guin

last updated 8/03