Timothy H. O'Sullivan (c. 1840–1882) was a prominent American photographer known for his documentary work during the American Civil War and his extensive landscape photography of the American West. He began his career as an apprentice to Mathew Brady in New York City before joining Brady's team in Washington, D.C., in 1861. O'Sullivan is celebrated for capturing poignant images of battlefields and later served as the official photographer for the United States Geological Exploration of the Fortieth Parallel (1867–1869) under Clarence King. He was appointed chief photographer for the U.S. Department of the Treasury in 1880 but died of tuberculosis shortly thereafter at age 41. His work is characterized by its stark, unvarnished depiction of both war and wilderness.[1,2,3,4,5,6]
