Wilhelm Heinrich Detlev KörnerWilhelm Heinrich Detlev Körner.

Wilhelm Heinrich Detlev "Big Bill" Körner (November 1878, August 11, 1938), also known as Wilhelm Heinrich Dethlef Koerner, William HD Koerner, WHDK, or W.H.D. Koerner, was a noted illustrator of the American West whose works became known to new audiences when his painting, nicknamed A Charge to Keep, was used as the cover image for the ghostwritten biography by the same name by George W. Bush. This painting, which hung in the Oval Office during the Bush presidency was of special interest to journalists due to the interpretation given by Bush of the painting's meaning in light of the meaning and title attached to the painting by the artist.