Various people and tendencies throughout the history of American journalism have been labeled "new journalism". Robert E. Park, for instance, in his "Natural History of the Newspaper", referred to the advent of the penny press in the 1830s as "new journalism". Likewise, the appearance of the yellow press—papers such as Joseph Pulitzer's "New York World" in the 1880s—led journalists and historians to proclaim that a "New Journalism" had been created. Ault and Emery, for instance, said "Industrialization and urbanization changed the face of America during the latter half of the Nineteenth century, and its newspapers entered an era known as that of the 'New Journalism. John Hohenberg, in "The Professional Journalist" (1960), called the interpretive reporting which developed after World War II a "new journalism which not only seeks to explain as well as to inform; it even dares to teach, to measure, to evaluate."