John Cullen Murphy (May 3, 1919 - July 2, 2004) was an artist known as a magazine and comic strip illustrator and for his work on the Prince Valiant comic strip. He became interested in art at the age of 15 when his neighbor Norman Rockwell asked him to model for a cover of the Saturday Evening Post.
In 1940, he entered the U.S. Army where he eventually became an anti-aircraft officer during World War II. He rose to the rank of major and was an aide to General Richard Marquat. During the war, he continued to illustrate, sending his work to the Chicago Tribune and painting numerous military portraits.