Scientist. A pioneer in the field of geology, his geological surveys (the "Hayden Surveys") of the American west, commissioned by the Unites States Government and done between, 1856 and the 1878 (only broken by the American Civil War, in which he served as a Union Army surgeon) led to a voluminous amount of information that aided expansion into and through those territories. His seminal work "Geological Report of the Exploration of the Yellowstone and Missouri Rivers in 1859-1860" (1869), contained much of that pioneering data. He was also the driving force behind the establishment of Yellowstone as the first National park (1872), which he convinced Congress to do with the aide of his raw data and some of the first wide format photos ever take (done by photographer William Henry Jackson). Additionally to his geological work, he was one of the first to bring back dinosaur fossils in great numbers for study in the east, and much of what he brought back is still housed in the collection of the Smithsonian Institute. The town of Hayden, Colorado is named for him.
Bio by: RPD2
Emma Woodruff Hayden