Rockefeller family
Beginning with Rockefeller Senior, the family has been a major force in land conservation. Over the generations, it has created more than 20 national parks and open spaces, including the Cloisters, Acadia National Park, Forest Hill Park, the Nature Conservancy, the Rockefeller Forest in California's Humboldt Redwoods State Park (the largest stand of old-growth redwoods), and Grand Teton National Park, among many others. Rockefeller Jr, and his son Laurance (and his son Larry) were particularly prominent in this area.