Norman Rockwell
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One of the most famous American painters, Rockwell is most well known for the covers on The Saturday Evening Post.  One of his most famous paintings is that of Rosie the Riveter, which has become an classic icon.  You can find some of his illustrations covering four decades, here.

Norman Rockwell's entry in Wikipedia.

Link to the Norman Rockwell Museum in Massachusetts and to the Norman Rockwell Museum of Vermont.

His Official Website