Philip Martiny (1858-1927), born in Strasbourg, Alsace (France), immigrated to the United States in 1878. He assisted Saint-Gaudens from 1880-1885, the burgeoning years of Saint-Gaudens fame, working on the Adams Memorial, the Puritan, and the Washington Inaugural Medal, among other commissions. In addition to his sculpture for the World's Columbian Exposition, Martiny was known for a large body of work, and trained several of Saint-Gaudens' assistants in his own studio.
John Flanagan (1865-1952), born in Newark, New Jersey, studied at the Cooper Union before becoming an assistant in Saint-Gaudens' New York studio. He continued his studies in Paris, where he also assisted Frederick MacMonnies on his fountain for the World's Columbian Exposition. Flanagan was known for his medals and his portraits in relief. He designed the silver twenty-five-cent piece in 1932.
Oscar Lenz (1874-1912), born in Providence, Rhode Island, studied with Saint-Gaudens at the Art Students League and is credited with having done much of the work on Diana.