Short answers, pulled from the story.
Charles Scribner's Sons was founded in 1846 by Charles Scribner I and Isaac D. Baker as Baker & Scribner. After Baker's death, Scribner renamed the firm the Charles Scribner Company, and it later became Charles Scribner's Sons when the family consolidated ownership.
Charles Scribner's Sons published Ernest Hemingway, F. Scott Fitzgerald, Edith Wharton, Thomas Wolfe, Henry James, Marjorie Kinnan Rawlings, Kurt Vonnegut, Stephen King, Don DeLillo, and Robert A. Heinlein, among others. The editor Maxwell Perkins was responsible for many of the firm's most celebrated author relationships.
Maxwell Perkins was an editor at Charles Scribner's Sons credited with developing the firm's list of major twentieth-century American authors, including F. Scott Fitzgerald, Ernest Hemingway, Thomas Wolfe, Ring Lardner, and Erskine Caldwell. He worked alongside editor John Hall Wheelock.
Scribner merged with Atheneum in 1978 and into Macmillan in 1984. Simon & Schuster bought Macmillan in 1994 and retained the Scribner trade imprint. The reference division and trademarks passed through Pearson, Thomson Corporation, and ultimately Gale, which is now part of Cengage Group.
The trade imprint Scribner is owned by Kohlberg Kravis Roberts following its acquisition of Simon & Schuster, where it operates as part of the Scribner Publishing Group. The reference division and the Charles Scribner's Sons trademarks are held by Cengage Group.
Scribner's Magazine was launched in 1886 after the Scribner family's legal prohibition on magazine publishing expired. It followed two earlier magazine ventures: Hours at Home, begun in 1865, and Scribner's Monthly, which the family sold in 1881 and which was renamed the Century Magazine.