Well, to make a long story short, Roy Lichtenstein was Jewish!
Since Roy Lichtenstein's mother was Jewish, and in Orthodox Judaism and Conservative Judaism, those with a Jewish mother (or those who underwent a halakhic conversion) are considered Jewish, then that makes him Jewish. His father was Jewish too.
Roy Lichtenstein (whose full birth name was Roy Fox Lichtenstein) was born on October 27, 1923 in Manhattan, New York, United States. Roy Lichtenstein passed away on September 29, 1997 (aged 73).
During the 1960s, along with Andy Warhol, Jasper Johns, and James Rosenquist among others, he became a leading figure in the new art movement. His work defined the basic premise of pop art better than any other through parody.
If you see any details that require update, please Let us know!