William Sumner Appleton Jr. | |
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| Born | May 29, 1874 |
| Died | November 24, 1947 (aged 73) |
| Burial place | Mount Auburn Cemetery |
| Nationality | American |
| Alma mater | Harvard College |
| Known for | Founder of SPNEA |
William Sumner Appleton Jr. (May 29, 1874 – November 24, 1947) was founder of the Society for the Preservation of New England Antiquities (SPNEA) in 1910. He was the chief force behind much of the preservation of historic homes in the New England area.