Perhaps I am too young to know about John F. Clymer, but I am now acquainted with him - happily so.
Upon entering the museum, located in Ellensburg, Washington, I was greeted and asked if I would like to see the video. Of course I would, and glad I did. :) Mr. Clymer was a contemporary of Norman Rockwell, and they both created illustrations for magazine covers. All told Mr. Clymer did 90 covers for the Saturday Evening Post.
Below are a few samples of his beautiful work.
Just in case you have not been to Ellensburg.