Karen Kruse Anderson was the widow and sometime co-author of Poul Anderson, and mother-in-law of writer Greg Bear.
She wrote the first published science fiction haiku (or scifaiku), "Six Haiku" in The Magazine of Fantasy & Science Fiction
, in July 1962, and is one of the founders of the Society for Creative Anachronism. She was invested as a member of the Baker Street Irregulars, and was active both in Sherlockian groups and in the Los Angeles Science-Fantasy Society. She died in 2018, aged 85.