Andy Warhol defined Pop Art. - Jeffrey Deitch (American art dealer and curator)

Andy Warhol and his pop art style are icons of our culture. 

Warhol (born Andrew Warhola) was an American artist, director, and producer, possibly the most famous of the American Pop Art movement. He originally pursued a career as a commercial illustrator and exhibited his work in several galleries in the 1950's.
His works explore the relationship between artistic expression, celebrity culture, and advertising that flourished by the 1960's, and span a variety of media, including painting, silkscreening, photography, film, and sculpture. Some of his best known works include the silkscreen paintings 'Campbell's Soup Cans' (1962) and 'Marilyn Diptych' (1962), the experimental film 'Chelsea Girls' (1966), and the multimedia events known as the 'Exploding Plastic Inevitable' (1966-67) - Wikipedia 
The repetitive, and cartoon styles are still influencing artists as well as using celebrities as subjects.
Much of Warhol's labor was performed by his workers under his direction, a practice that dates back centuries with artist's aprentices. Warhol's New York studio, known at the Factory was a meeting ground for emerging artists, actors, filmmakers celebrities, bohemians, street people, and wealthy patrons. A popular hangout and famous for its parties and drug use.
Feminist writer and Warhol fanatic, Valerie Solanas shot Warhol and Mario Amaya, art critic and curator at the Factory after being turned away, never being fully accepted by the group. He was seriously wounded, barely survived and suffered physical effects for the rest of his life which had a profound effect on him and his art. Warhol displays the scars from his attack in Richard Avedon's portrait of him.