Tom Wesselmann, American, 1931 to 2004, color lithograph on paper, Bedroom Collage, after the original mixed media liquitex and collage on canvas mounted on Korpine, 1974. Circa: late 20th century. Thomas K. Wesselmann was an American artist associated with the Pop Art movement who worked in painting, collage and sculpture. Modern Graphic Art Prints and Collectibles.