Gerhard Ernest Untermann, Sr. (1864–1956) was a German-American seaman, socialist author, translator, newspaper editor. In his later life he was Director of the old Washington Park Zoo in Milwaukee, a geologist, fossil hunter, and artist.

The International Socialist Review was a monthly magazine published in Chicago, Illinois by Charles H. Kerr & Co. from 1900 until 1918. The magazine was chiefly a Marxist theoretical journal during its first years under the editorship of A.M. Simons. Beginning in 1908 the publication took a turn to the left with publisher Charles H. Kerr taking over the main editorial task. The later Review featured heavy use of photographic illustration on glossy paper and mixed news of the contemporary labor movement with its typical theoretical fare.