The George Perkins Marsh Boyhood Home, also known as the Marsh-Billings House, is the architectural centerpiece of Marsh-Billings-Rockefeller National Historical Park, in Woodstock, Vermont, United States,  The 550 acre estate on which it stands was given by Mary French Rockefeller (the granddaughter of Frederick Billings) and which American philanthropist, businessman, financier, and major conservationist?