Andy Warhol (/ˈwɔrhɒl/; August 6, 1928 – February 22, 1987) was an American artist who was a leading figure in the visual art movement known as pop art. His works explore the relationship between artistic expression, celebrity culture and advertisement that flourished by the 1960s. After a successful career as a commercial illustrator, Warhol became a renowned and sometimes controversial artist. The Andy Warhol Museum in his native city, Pittsburgh, Pennsylvania, holds an extensive permanent collection of art and archives. It is the largest museum in the United States dedicated to a single artist. Warhol's art encompassed many forms of media, including hand drawing, painting, printmaking, photography, silk screening, sculpture, film, and music. He was also a pioneer in computer-generated art using Amiga computers that were introduced in 1984, two years before his death. He founded Interview Magazine and was the author of numerous books, including The Philosophy of Andy Warhol and Popism: The Warhol Sixties. He is also notable as a gay man who lived openly as such before the gay liberation movement. His studio, The Factory, was a famous gathering place that brought together distinguished intellectuals, drag queens, playwrights, Bohemian street people, Hollywood celebrities, and wealthy patrons.