Paintings were scattered all over the floor, ready to be hung, that day last month when Jacqueline Kennedy unexpectedly walked into Manhattan's Graham Galleries. With a trained eye and an eager appetite, the First Lady examined them, chose two (but left them behind for the show), went out the door and up Madison Avenue. Word traveled fast, and when the show opened, viewers thronged into the gallery. The artist: Thomas Anshutz, a nearly unknown turn-of-the-century American remembered more as a teacher of painters than as a painter himself.
Anshutz was a student of nature, drawing most of his inspiration from the workaday...