 The Science Fiction Writers of America made Simak its third SFWA Grand Master in 1977, after Robert Heinlein and Jack Williamson.In 1987 the Horror Writers Association named him one of three inaugural winners of the Bram Stoker Award for Lifetime Achievement, with Fritz Leiber and Frank Belknap Long.Asteroid 228883 Cliffsimak, discovered by French amateur astronomer Bernard Christophe in 2003, was named in his memory.