Anton R. Roessler (c. 1833–1893) was an Austro-Hungarian-American cartographer and geologist. Little is known about his early life. He first appears in records in Texas in late 1858. Roessler worked as an assistant and draftsman in the first state Geological and Agricultural Survey of Texas, the "Shumard Survey", conducted by the chief geologist of the state, Benjamin Franklin Shumard. He continued to work in that position until 1862, when the survey was disbanded and the survey's offices in Austin, Texas, were converted to wartime uses during the American Civil War. Roessler then served the Confederacy as the chief draftsman at the Texas State Military Board's arsenal, also in Austin. However, in February 1865, Roessler mysteriously arrived in Louisiana where he shared information to Unio