Gray's Peak / photographed and published by W.G. Chamberlain, Denver, Colorado.

William Gunnison Chamberlain was an American photographer born in New York City on 16 November 1815. Chamberlain began his career as a portrait painter, but in the early 1840s he became interested in photography. He learned the daguerreotype process and opened a studio in New York City in 1843. He quickly gained a reputation for his work and became one of the most sought-after photographers of his time. Chamberlain was known for his portraits of famous people, including politicians, actors and writers. He also photographed landscapes and cityscapes, and his images of Niagara Falls were particularly popular. In addition to his work as a photographer, Chamberlain was also an inventor. He patented several improvements to the daguerreotype process, including a device for taking panoramic photographs. Chamberlain continued to work as a photographer until the late 1870s, when he retired. He died on 17 January 1910 at the age of 94. His legacy lives on through his photographs, which are now held in collections around the world.