Timothy H. O'Sullivan

Alexander Gardner worked as a photographer on the staff of General George B. McClellan, commander of the Army of the Potomac, and was given the honorary rank of captain.

Biographer James D. Horan writes that O'Sullivan was a civilian photographer attached to the Topographical Engineers.

[2] In July 1863, he created his most famous photograph, A Harvest of Death, depicting dead soldiers from the Battle of Gettysburg.

He took many other photographs documenting the battle, including Dead Confederate sharpshooter at foot of Little Round Top,[3] Field where General Reynolds fell,[4] View in wheatfield opposite our extreme left,[5] Confederate dead gathered for burial at the southwestern edge of the Rose woods,[6] Bodies of Federal soldiers near the McPherson woods,[7] "Slaughter pen",[8] and others.

From 1867 to 1869, he was the official photographer on the United States Geological Exploration of the Fortieth Parallel under Clarence King.

[10] He faced starvation on the Colorado River when some of the expedition's boats capsized; few of the 300 negatives he took survived the trip back East.

[citation needed] He spent the last years of his short life in Washington, D.C., as official photographer for the U.S. Geological Survey and the Treasury Department.

O'Sullivan c. 1871 –1874
Timothy H. O'Sullivan, Characteristic ruin, of the Pueblo San Juan, New Mexico, on the north bank of the San Juan River, about 15 miles west of the mouth of Cañon Largo, 1874, stereoscopic albumen prints, National Gallery of Art, Washington, DC, Department of Image Collections.
Timothy H. O'Sullivan, Pueblo San Juan, New Mexico, 1874, stereoscopic albumen prints , National Gallery of Art, Washington, DC, Department of Image Collections.