Janet Opal Asimov (née Jeppson; August 6, 1926 – February 25, 2019), usually writing as J. O. Jeppson, was an American science fiction writer, psychiatrist, and psychoanalyst. She started writing children's science fiction in the 1970s. She was married to Isaac Asimov from 1973 until his death in 1992, and they collaborated on a number of science fiction books aimed at young readers, including the Norby series. She died in February 2019 at the age of 92.