Lichtenstein was a leading figure of the Pop Art movement in the 1960s. Inspired by advertisements and comic strips, Lichtenstein's bright, graphic works were both a commentary on American popular culture and a reaction to the recent success of Abstract Expressionist painters, such as Jackson Pollock and Willem de Kooning. Rather than expressing his personal process or emotional life, he mimicked his sources right down to the impersonal stencil process that represented the mechanical printing used in the commercial art world. He received a number of awards during his lifetime, including the American Academy of Arts and Letters in 1979 and the National Medal of Arts in 1995. The Roy Lichtenstein Foundation was established in 1999, two years after his death. His work can be found in major museums across the world, such as the Museum of Modern Art, New York; the Metropolitan Museum of Art, New York; the Museum of Contemporary Art, Los Angeles; the National Gallery of Art, Washington D.C.; and Museum Ludwig, Cologne, Germany.