(New York City, New York, 1840 - 1/14/1882, Staten Island, New York)
Note: O'Sullivan was part of Matthew Brady's team documenting the Civil War in Gettysburg and Richmond in 1861. From 1867 to 1870, O'Sullivan was a photographer for Clarence King's 40th Parallel Survey. In 1870 O'Sullivan was the photographer for the Selfridge Expedition to Panama. Died 14 January 1882.