American artist whose works appeared on the cover of The Saturday Evening Post for over forty years ensuring he was known to and loved by Americans everywhere.   He first studied at the National Academy of Design and later at the Art Students League in New York.   Perhaps best known for his "Four Freedoms" posters symbolizing for millions the war aims as described by President Franklin Roosevelt.    Also painted portraits of world figures including Nassar of Egypt, Nehru of India and American Presidents Eisenhower, Kennedy and Johnson.