 Ida Tarbell wrote an expose of John D. Rockefeller's Standard Oil Company in 1904 with The History of Standard Oil. The Jungle, Upton Sinclair's investigation of Chicago's meatpacking industry, was published in 1906. Henry Adams wrote about the changes at the dawn of the 20th century with The Education of Henry Adams, published in 1907. And William James' philosophical work, Pragmatism, was also published in 1907.