Forrest J Ackerman (November 24, 1916 – December 4, 2008) was an American collector of science fiction books and movie memorabilia and a science fiction fan. He was, for over seven decades, one of science fiction's staunchest spokesmen and promoters.
Ackerman was a Los Angeles, California-based magazine editor, science fiction writer and literary agent, a founder of science fiction fandom and possibly the world's most avid collector of genre books and movie memorabilia. He was the editor and principal writer of the American magazine Famous Monsters of Filmland, as well as an actor and producer (Vampirella).
Also called “Forry,” “The Ackermonster,” “4e” and “4SJ,” Ackerman was central to the formation, organization, and spread of science fiction fandom, and a key figure in the wider cultural perception of science fiction as a literary, art and film genre. Famous for his word play and neologisms, he coined the genre nickname “sci-fi”. In 1953, he was voted “#1 Fan Personality” by the members of the World Science Fiction Society, a unique Hugo Award never granted to anyone else.
He was also among the first and most outspoken advocates of Esperanto in the science fiction community.