He joined the 1870 and 1871 expeditions led by Ferdinand Hayden to do geological surveys of the American west, where most of these pictures are from. And something you would only find on Wikipedia: he was a great-great nephew of Samuel Wilson, the progenitor of America's national symbol Uncle Sam.
At first I thought the first two pictures here were the same image, but then I saw the subtle differences. They must have been taken less than a minute apart (or as soon as was possible with 1870 photographic technology - probably longer than a minute).
A noon meal in Ferdinand V. Hayden's camp of the U.S. Geological Survey.
Red Buttes, Wyoming Territory, August 24, 1870
A noon meal in Ferdinand V. Hayden's camp of the U.S. Geological Survey.
Red Buttes, Wyoming Territory, August 24, 1870
Botanist Sir Joseph Dalton Hooker, left, ca. 1877
[I assume that's the guy sitting on the ground]
Boteler Brothers Ranch, Paradise Valley, 1871
Geological Survey Expedition members at Firehole Basin, 1872
Hayden & Walter Pairs, in camp, 1871
Hayden expedition in camp, 1872
Horse-drawn odometer, 1871
Individuals on horseback, Garden of the Gods, Colorado
Joe & Jose Clark, Hayden Expedition, 1871
Nez Perce Encampment on Yellowstone River, 1871
Seattle dock, 1901-06
Street view in Corinne, Boxelder County, Utah, 1869
The U.S. Geological and Geophysical Survey of the Territories en route with
pack train upon the trail between the Yellowstone and East Fork Rivers, 1871