John Henry O'Hara (January 31, 1905 – April 11, 1970) was an American writer. He was one of America's most prolific writers of short stories, credited with helping to invent The New Yorker magazine short story style. He became a best-selling novelist before the age of 30 with Appointment in Samarra and BUtterfield 8. While O'Hara's legacy as a writer is debated, his work was praised by such contemporaries as Ernest Hemingway and F. Scott Fitzgerald, and his champions rank him highly among the major under-appreciated American writers of the 20th century.