After the American Civil War, Keckley wrote and published an autobiography, Behind the Scenes: Or, Thirty Years a Slave and Four Years in the White House (1868). It was both a slave narrative and a portrait of the First Family, especially Mary Todd Lincoln, and is considered controversial for breaking privacy about them. It was also her claim as a businesswoman to be part of the new mixed-race, middle-class that was visible among the leadership of the black community.
Keckley's relationship with Mary Todd Lincoln, the President's wife, was notable for its personal quality and intimacy, as well as its endurance over time. (wikipedia.org)