Born in 1841, Juliana Horatia Gatty was the daughter of the Rev. Alfred Gatty, a Church of England vicar, and an author, and of Margaret Gatty, also an author. She was married to Major Alexander Ewing, of the British army pay department, in 1867, relocating with him to New Brunswick, Canada, for the first two years of their marriage. Although Major Ewing was posted abroad again, in 1879 and 1881, Mrs. Ewing was prevented from accompanying him by ill health. She moved to Bath in 1885, in the hopes that the change would improve her health, but she died there that same year.

Juliana Horatia Ewing - sometimes also styled Juliana Horatia Gatty Ewing, or just "Mrs. Ewing" - is credited by Roger Lancelyn Green as being the author of the the "first outstanding child-novels" in English literature. In addition to her children's novels, Ewing also edited a number of magazines for young readers, including the Nursery Magazines (from 1856), the Monthly Packet and the monthly Aunt Judy's Magazine (both from 1866).