Westmoreland Museum of American Art. The Westmoreland Museum of American Art is an art museum in Greensburg devoted to American art, with a particular concentration on the art of southwestern Pennsylvania. Art lover Mary Marchand Woods bequeathed her entire estate to establish The Woods Marchand Foundation in 1949. The museum developed from this foundation, opening ten years later. William H. Gerdts wrote that in western Pennsylvania the Westmoreland Museum of Art in Greensburg, rather than the Carnegie Institute in Pittsburgh, has pioneered regional investigations. A Tim Prentice kinetic sculpture is installed in the south facade.