James Otto Lewis started out as an engraver in Philadelphia around 1815. Fascinated by what he learned of the western territories, as a young man he went west in 1819. Traveling with the governor of the Michigan Territory Lewis worked for the United States government painting official portraits of Native Americans in the course of his employment which included attending numerous treaties and ceremonies so these are painted from life. Learn more about him here https://en.wikipedia.org/wiki/James_Otto_Lewis. Quite a few so more for later posts, too.