 The projects Harrington managed during his career with the National Park Service included the Jamestown Glass Works, Appomattox Court House, Fort Raleigh in North Carolina, and George Washington's Fort Necessity in Pennsylvania.Harrington retired from his career with the National Park Service in 1965.The Harringtons continued to take part in archaeological work, however, excavating several sites in Nauvoo, Illinois for The Church of Jesus Christ of Latter-day Saints and sites on West Point Military Academy's Constitution Island.