Kemp knew many of the bohemian and progressive literary and cultural figures of his generation, including Elbert Hubbard, Upton Sinclair, Ida Tarbell, Bernarr MacFadden, Sinclair Lewis, Max Eastman, Eugene O'Neill, Edmund Wilson, John Dos Passos, E. E. Cummings, and many others.
IDA | Ida Lupino | Ida | Ida Tarbell | Ida Nilsen | Princess Ida | Mount Ida | Ida B. Wells | Princess Ida of Schaumburg-Lippe | Mount Ida High School | Joseph "Joe" Ida | Joseph Ida | Jim Tarbell | Ida Wüst | Ida Presti | Ida Nudel | IDA Ireland | Ida Elizabeth Osbourne | Ida Darwin | Ida (band) | Edmund C. Tarbell | Queen Ida | Mount Ida (Crete) | Imouzzer Ida Ou Tanane | Ida S. Scudder | Ida Saxton McKinley | Ida Rolf | Ida Raming | Ida of Lorraine | Ida Makes a Movie |
Examples of its work include Ida Tarbell's series in 1902 exposing the monopoly abuses of John D. Rockefeller's Standard Oil Company, and Ray Stannard Baker's earlier look at the United States Steel Corporation, which focused the public eye on the conduct of corporations.
McClure's Magazine published influential pieces by respected journalists and authors including Ida Tarbell, Upton Sinclair, Burton J. Hendrick, Rudyard Kipling, Sir Arthur Conan Doyle, Robert Louis Stevenson, Willa Cather, and Lincoln Steffens.