 The work of William Henry Jackson in the mid-19th century was instrumental in convincing Congress in 1872 to create Yellowstone, the first national park in the United States.Photography produced by Philip Hyde for the Sierra Club found extensive use in promoting the preservation of natural places in the Western United States during the 20th century.Renowned landscape photographer Ansel Adams received both a Conservation Service Award and a Presidential Medal of Freedom in recognition of the influence of his work on the preservation of wilderness and fostering of environmental consciousness.