Timothy O’Sullivan: A man sits on a shore beside the Colorado River in Iceberg Canyon, on the border of Mojave County, Arizona, and Clark County, Nevada in 1871 during the Wheeler expedition. Lieutenant Wheeler insisted that the team explore the Colorado River by going upstream into the Grand Canyon—apparently to beat a rival, who had first gone downriver in 1869. There was no particular scientific reason to do the trip backward.
Timothy O’Sullivan: The junction of Green and Yampah Canyons, in Utah, in 1872. O’Sullivan has been described as the right person who was there at the right time as he managed to document the re-birth of the nation through war in the early 1860’s and then managed to be at the nexus of the great wave of exploration and migration westwards as the United States assumed what it thought to be its manifest destiny.