His farm flourished .
Is still an operating farm today , continued through the stewardship of Billings ' granddaughter Mary French Rockefeller and her husband , conservationist Laurance Spelman Rockefeller .
His farm flourished and is still an operating farm today , continued through the stewardship of Billings ' granddaughter Mary French Rockefeller and her husband , conservationist Laurance Spelman Rockefeller .