Joseph Storer Clouston OBE was a Scottish author and historian.

John Griffith Chaney, better known as Jack London, was an American novelist, journalist and activist. A pioneer of commercial fiction and American magazines, he was one of the first American authors to become an international celebrity and earn a large fortune from writing. He was also an innovator in the genre that would later become known as science fiction.

Jack Randall Crawford (1878–1968) was an author of novels, plays, and literary criticism and a professor of English at Yale University; he is perhaps best known for his 1922 autobiographical novel I Walked in Arden and his 1928 nonfiction What to Read in English Literature.

John Frederick Snow, born Piqua, Ohio was an American radio writer, writer of ghost stories, and scholar, primarily of the works of L. Frank Baum. When Baum died in 1919, the twelve-year-old Snow offered to be the next Royal Historian of Oz, but was politely turned down by a staffer at Baum's publisher, Reilly & Lee. Snow eventually wrote two Oz books: The Magical Mimics in Oz (1946) and The Shaggy Man of Oz (1949), as well as Who's Who in Oz (1954), a thorough guide to the Oz characters, all of which Reilly & Lee published.

Jack Thorne FRSL is a British playwright, television writer, screenwriter, and producer.

John Holbrook Vance was an American mystery, fantasy, and science fiction writer. Though most of his work has been published under the name Jack Vance, he also wrote several mystery novels under pen names.

John Stewart Williamson, who wrote as Jack Williamson, was an American science fiction writer, one of several called the "Dean of Science Fiction". He is also credited with one of the first uses of the term genetic engineering. Early in his career he sometimes used the pseudonyms Will Stewart and Nils O. Sonderlund.

Jacob Abbott was an American writer of children's books.

Jacob Bigelow was an American physician, botanist and botanical illustrator. He was architect of Mount Auburn Cemetery in Cambridge, Massachusetts, husband to Mary Scollay, and the father of physician Henry Jacob Bigelow. The standard author abbreviation Bigelow is used to indicate this person as the author when citing a botanical name.

Jacob Breda Bull was a Norwegian author, journalist and editor.