Alexander Milne Calder
Alexander Milne Calder was a Scottish American sculptor best known for the architectural sculpture of Philadelphia City Hall. Both his son, Alexander Stirling Calder, and grandson, Alexander Sandy Calder, became significant sculptors in the 20th century.
Alexander Milne Calder was born in Aberdeen, Scotland, the son of a tombstone carver. He began his career in Scotland, working for sculptor John Rhind, the father of sculptor J. Massey Rhind while attending the Royal Academy in Edinburgh. He moved to London and worked on the Albert Memorial. Calder immigrated to the United States in 1868 and settled in Philadelphia, where he studied with Joseph A. Bailly, and took classes with Thomas Eakins at the Pennsylvania Academy of Fine Arts.
Source: Wikipedia