Henry St. John Cooper

Charles Henry St. John Cooper (1869–1926), usually published as Henry St. John Cooper, was an English novelist and story writer known for school stories, adventure tales, and fiction for popular weekly papers. Sources consistently describe him as remarkably prolific, with a vast output for Amalgamated Press and related periodicals.

He is best known for creating Pollie Green in 1908, a character often singled out as one of the most popular schoolgirl heroines of her day. He also wrote under the pen name Mabel St. John, which adds another layer to his already wide-ranging career.

Although detailed personal information is harder to confirm than his publishing record, his reputation as a major contributor to early 20th-century popular fiction is clear. Readers drawn to brisk storytelling, school settings, and old-style adventure will find him an important name in that tradition.