Norman Rockwell Museum Stockbridge Mass.
http://www.nrm.org/
This is a description of Rockwell and his art fro the Museum's web site.
Over the years I've done many series of ads . . . I've tried to accept only those jobs which I believe I'll enjoy doing". ?-Norman Rockwell
Norman Rockwell's early success and popularity as an illustrator gained him celebrity status at a young age. As a result, companies actively sought his talents to help advertise their products.
As an art student, Rockwell and his classmates expressed little interest in commercial work. "[We] signed our names in blood," he said, "....never to do advertising jobs, never to make more than fifty dollars a week." But when he was just twenty, his first advertisement, for Heinz Baked Beans, was published.
By the 1940s, Rockwell's name was a household word, and his illustrations provided product endorsements for a wide range of companies.
Advertising did not have the same creative dimension that Rockwell enjoyed as cover and story artist, since clients or agencies generally presented him with concepts to illustrate. It did offer the artist better compensation and exposure than magazine illustration, and Rockwell accepted commissions from over 150 companies for advertisements, posters, and calendar illustrations.
http://www.nrm.org/exhibits/current/ads.html