Going Lanphier (1727-1813) was a carpenter, joiner, and housebuilder from Alexandria whom GW hired in 1759 to add a story to his house at Mount Vernon. Lanphier also performed some small tasks for GW in 1765, which included "Turng 3 Axletrees" (Ledger A, 211).  GW employed his services again in 1774-76, at which time Lanphier worked towards extending both ends of the mansion house by adding a downstairs library and an upstairs master bedroom on the south end, and a two-story banquet (or new) room on the north. The southern addition was completed by the end of 1775, but the work on the interior of the northern addition was still incomplete when GW returned to Mount Vernon in late 1783.