Thomas Moran’s vision of the Western landscape was critical to the creation of Yellowstone National Park. In 1871 Dr. Ferdinand Hayden, director of the United States Geological Survey, invited Moran, at the request of American financier Jay Cooke, to join Hayden and his expedition team into the unknown Yellowstone region. Hayden was just about to embark on his arduous journey when he received a letter from Cooke presenting Moran as “an artist of Philadelphia of rare genius”. Funded by Cooke (the director of the Northern Pacific Railroad), and Scribner’s Monthly, a new illustrated magazine, Moran agreed to join the survey team of the Hayden Geological Survey of 1871 in their exploration of the Yellowstone region. During forty days in the wilderness area, Moran visually documented over 30 different sites and produced a diary of the expedition’s progress and daily activities. His sketches, along with photographs produced by survey member William Henry Jackson, captured the nation’s attention and helped inspire Congress to establish the Yellowstone region as the first national park in 1872.