Roy Lichtenstein, American, 1923 to 1997, offset print triptych As I Opened Fire, 1967. Roy Fox Lichtenstein was a pop artist. During the 1960s, along with Andy Warhol, Jasper Johns, and James Rosenquist, he became a leading figure in the new art movement. His work defined the premise of pop art through parody. American Prints And Art Collectibles.