William Henry "Will" Irwin was an American author, writer and journalist who was associated with the muckrakers. During and after the war Irwin wrote 17 more books, including a biography of Herbert Hoover, a history of Paramount Pictures and its founder Adolph Zukor, The House That Shadows Built (1928), and his autobiography, The Making of a Reporter (1942). He also wrote two plays and continued magazine writing.