No biographical information on J. Van Buren is available. Cornelius R. Hanleiter (1815-1897) was born in Savannah, Georgia, the son of John Jacob Hanleiter and Elizabeth MacFarland. He was a printer, telegraph operator, and publisher in Atlanta. He also served on the Atlanta City Council and as Justice of the Inferior Court of Fulton County. He was married twice: first in 1834 to Mary Ann Ford, and again in 1849 to Ann Eliz Shaw. In all he had 14 fourteen children.
From the description of J. Van Buren letter, 1867. (Georgia Historical Society). WorldCat record id: 166147789