Were Stewart O'Nan and John O'Hara of the same nationality?  
Stewart O'Nan: Stewart O'Nan (born February 4, 1961) is an American novelist. John O'Hara: John Henry O'Hara (January 31, 1905 – April 11, 1970) was an American writer, best remembered as a keen observer of social status and manners in early to mid 20th century America and pre-eminent among his contemporaries at depicting social realism.
yes