John E. Weyss (1820 - June 24, 1903) was an Austrian-American illustrator, cartographer, and engineer. Born in Vienna, Weyss immigrated to the United States in 1848 and settled in New York. He served as a member of the U.S. Government's Mexican Boundary Survey (1849 - 1855), led by Major William Hemsley Emory, because of his training as an illustrator. In the capacity of a civilian artist working for the army, Weyss contributed several illustrations for Emory's report, which was published in 1857-59. Weyss is also credited on eleven of the report's maps. At the outbreak of the American Civil War, Weyss held a position as a civil engineer for the state of Kentucky. Weyss received a commission as a major from the Governor of Kentucky and, due to his professional experience, was assigned to the staff of Captain Nathaniel Michler, the chief topographical officer in the Army of the Ohio. In this role he did survey work for maps of the vicinity of Shiloh and Corinth, both sites of major Civil War battles. Weyss then joined Captain Michler when he moved to the staff of General Rosecrans in late 1862, for whom they made a series of maps of the Battle of Stones River. Weyss and Michler were then transferred to the Army of the Potomac in May, 1863. One of Weyss's first assignments for the Army of the Potomac was a map of the vicinity of Harper's Ferry, Virginia, for which he produced a highly detailed map of the very complex topography of the region. Soon, Weyss was made responsible for the day-to-day detailed mapping during the siege at Petersburg. After the war, Weyss served as the principal surveyor under the direction of Michler during the creation of the atlas Military maps illustrating the operations of the armies of the Potomac and James, May 4th 1864 to April 9th 1865, that was published in 1869. Weyss served the U.S. Army Corps of Engineers for another twenty years, until he retired sometime in the 1880s. Weyss died on June 4, 1903, in Washington, D.C.

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