Fritz Willis' 15-year stint of Artists's Sketchbook and other calendars for Brown & Bigelow made him one of the last pin-up greats. He did massive amounts of story an ad work during his time for publications such as Esquire and the Saturday Evening Post. An author himself, he wrote instruction books for Walter Foster (Art Secrets and Shotcuts, The Nude, Faces and Features, The Model, and a number of children's books.