Roy Lichtenstein was one of the first American Pop artists to achieve widespread renown, and he became a lightning rod for criticism of the movement. His early work ranged widely in style and subject matter, and displayed considerable understanding of modernist painting: Lichtenstein would often maintain that he was as interested in the abstract qualities of his images as he was in their subject matter. However, the mature Pop style he arrived at in 1961, which was inspired by comic strips, was greeted by accusations of banality, lack of originality, and, later, even copying. His high-impact, iconic images have since become synonymous with Pop art, and his method of creating images, which blended aspects of mechanical reproduction and drawing by hand, has become central to critics’ understanding of the significance of the movement.
American Painter, Sculptor, and Lithographer
In the late 1940s, Lichtenstein exhibited his art in galleries nationwide, including in Cleveland and New York City. In the 1950s, he often took his artistic subjects from mythology and from American history and folklore, and he painted those subjects in styles that paid homage to earlier art, from the 18th century through modernism.
Lichtenstein died of complications from pneumonia on September 29, 1997, at the New York University Medical Center in Manhattan.
In 1951, Lichtenstein had his first solo exhibition at the Carlebach Gallery in New York.   He moved to Cleveland in the same year, where he remained for six years, although he frequently traveled back to New York. During this time he undertook jobs as varied as a draftsman to a window decorator in between periods of painting.  His work at this time fluctuated between Cubism and Expressionism.  In 1954, his first son, David Hoyt Lichtenstein, now a songwriter, was born. His second son, Mitchell Lichtenstein, was born in 1956. 
Furthermore, Campbell notes that there was a time when comic artists often declined attribution for their work. 
As a teenager, Lichtenstein studied briefly with the painter Reginald Marsh. After serving in the military during World War II, he attended the Ohio State University, teaching there from 1946 to 1951 and receiving a masters degree in 1949. He also taught at New York State University College, Oswego (1957–60), and at Douglass College of Rutgers University, New Brunswick, New Jersey (1960–63).
At the start of his artistic career, Lichtenstein painted themes from the American West in a variety of modern art styles; he dabbled in 1957 even in Abstract Expressionism, a style he later reacted against. His interest in the comic-strip cartoon as an art theme probably began with a painting of Mickey Mouse and Donald Duck he made in 1960 for his children. Although he was initially dissatisfied with his technique and uncomfortable with direct appropriation, he took great pleasure in presenting well-known comic-strip figures in a fine art format. He increased the size of his canvases and began to manipulate to his own ends the graphic and linguistic conventions of comic strips dealing with such genres as romance, war, and science fiction. In the style of comic strips, he used words to express sound effects. He developed a detached, mass-produced effect by outlining areas of primary colour with thick black lines and by using a technique that simulated benday screening (a dot pattern used by engravers).
Roy Lichtenstein, “A Review of My Work Since 1961—A Slide Presentation” (1995), reprinted in Roy Lichtenstein, ed. Graham Bader (Cambridge, MA: The MIT Press, 2009), 58.
In this rigorously manual process, he used perforated templates to replicate and often exaggerate the dot patterning commonly used in printing imagery. Known as Ben-Day dots, this patterning became a signature element of his style, which incorporated the look of mechanical reproduction into the fine-art world of painting. His transformations of the source image typically included reducing the color palette to saturated primaries, eliminating incidental details, heightening contrasts, and “emphasizing the pictorial clichés and graphic codes of commercially printed imagery.” 3 In Drowning Girl, for example, Lichtenstein cropped out much of the original scene and modified the statement in the text bubble, amplifying this image of a damsel in distress.