"William Robert Shepherd (12 June 1871 in Charleston, South Carolina - 7 June 1934 in Berlin, Germany) was an American cartographer and historian specialising in American and Latin American history.
In 1896, Shepherd made his PhD at Columbia University. He then studied in Berlin and finally became professor of history at Columbia University. He is best known for his Historical Atlas, published in several editions during the early twentieth century."
Source: Wikipedia, "William Robert Shepherd", available under the CC-BY-SA License.