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In page Alexander Milne Calder:

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In 1873, he was hired by architect John McArthur, Jr., to produce models for the sculptures adorning Philadelphia City Hall. The commission required more than 250 marble and bronze pieces and took Calder twenty years to complete. That same year, Calder was commissioned by the forerunner of Philadelphia's current Association for Public Art, the Fairmount Park Art Association, to create an equestrian statue of Major General George Gordon Meade for Fairmount Park. Then in 1875, he won the competition for the colossal (37 foot tall) bronze statue of William Penn that was to crown the new City Hall's tower. That portrait sculpture remains to this day the largest atop any building in the world.[1][2][3]