Roy Lichtenstein was a prominent American pop artist known for his large-scale paintings that emulated the style of comic strips and advertisements from popular magazines. Some of his most famous works include "Girl with Ball" from 1961, which simplified and enlarged comic imagery to create a monumental style. His 1963 painting "WHAAM" depicted violent imagery from war comics in a mechanical, removed style. Lichtenstein often used techniques like benday dots, solid colors and outlines to mimic the look of mass reproduction. His work commented on themes like violence, love and the intersection of popular and high art.