Guillaume Tell Poussin

Guillaume Tell de La Vallée-Poussin (1794–1876) was a French engineer and diplomat. He served as a captain in the United States Army Corps of Engineers and aide-de-camp to General Simon Bernard, working under the War Department’s Board of Engineers for Internal Improvements (1824–1831) on multi-state road and canal surveys. He later interpreted American internal improvements and railways for European readers and served as ambassador of the French Second Republic to the United States (1848–1849) before recall after a dispute with U.S. Secretary of State John M. Clayton. Provided by Wikipedia