Robert Green holds a master's degree in journalism from New York University and a bachelor's degree in English literature from Boston University. He has also studied Chinese in Taiwan. Green is the author of Theodore Roosevelt and Woodrow Wilson in this series. He has also written twenty other nonfiction books for young readers, including Modern Nations of the World: China and Modern Nations of the World: Taiwan, as well as biographies of historical figures including Julius Caesar, Cleopatra, Alexander the Great, Tutankhamun, Herod the Great, and Hannibal.