Alexander Milne Calder (August 23, 1846 – June 4, 1923) (MILL-nee) was a Scottish American sculptor best known for the architectural sculpture of Philadelphia City Hall.

In 1868, he emigrated to the United States and settled in Philadelphia, where he studied with Joseph A. Bailly and attended the Pennsylvania Academy of Fine Arts.

In 1873, he was hired by architect John McArthur Jr., to produce models for the sculptures adorning Philadelphia City Hall.

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.

[3][4][5] Calder is buried in West Laurel Hill Cemetery in Bala Cynwyd, Pennsylvania, a Philadelphia suburb.