One of this artists more notable non-memorials is the statue of Diana which spent over 30 years on top of Madison Square Garden. His more notable works are Civil War memorial works including the statue of Farragut in New York's Madison Square, the Standing Lincoln in Chicago's Lincoln Park (with copies in London and Springfield), and perhaps most notably the Robert Gould Shaw and Massachusetts 54th Memorial at the Boston Common. Identify this American artist with a hyphenated last name who also designed "the most beautiful American coin in history", the $20 double eagle gold piece minted from 1907 to 1933 (and whose name is commonly given to the coin).
Augustus Saint-Gaudens