Stephen Mather was an American businessman and conservationist, best known for his role as the first director of the National Park Service (NPS) in the United States. Appointed in 1917, he played a crucial role in promoting and protecting national parks, advocating for their preservation and public enjoyment. Mather's leadership helped establish the NPS as a vital agency for environmental conservation. Mather was instrumental in the creation of several national parks and worked to improve park facilities and visitor services. His efforts contributed to the growth of the national park movement, inspiring future generations to appreciate and protect America's natural landscapes.