Samuel Sidney McClure was an Irish-American publisher who became known as a key figure in investigative, or muckraking, journalism. He co-founded and ran McClure's Magazine from 1893 to 1911, which ran numerous exposées of wrongdoing in business and politics, such as those written by Ida Tarbell, Ray Stannard Baker, and Lincoln Steffens. The magazine ran fiction and nonfiction by the leading writers of the day, including Sarah Orne Jewett, Mark Twain, William Dean Howells, Joel Chandler Harris, Jack London, Stephen Crane, William Allen White and Willa Cather.