Quite a few writers have won more than one Prometheus award since the awards were launched in the 1970s, but nobody has won more than the late great Robert Heinlein.

Libertarian Futurist Society members proved anew how much they remain ardent fans of Heinlein (1907-1988) by voting his 1966 novelette “Free Men” the 2023 Best Classic Fiction winner and thereby inducting it into the Prometheus Hall of Fame.
That marks the ninth novel, novelette or story by Heinlein to be recognized with a Prometheus Award – a record.