I think I've often admired the work of American artist David Stone-Martin, but I haven't known his name or the full extent of his influence on postwar graphic design and illustration. He is most closely associated with the illustrations he did for jazz records. As he illustrated over 400 album covers, I think that if you have any jazz records lying about you will find that the cover is more than likely to be by David Stone-Martin. Although he is most well known for his album covers, he also designed and illustrated posters, books, advertisements for film, television and the theatre and magazine covers. There is a very nice bio of him here.
He reminds me quite a bit of one of my favourite illustrators/ cartoonists Ronald Searle and perhaps that's because they both came up in the postwar era.
I love the colours he uses! How nice it would be to have these as enormous posters in your house!