Probably John Steinbeck. He was always a favourite of mine. I was quite surprised that it took him so long to eventually pick up that very coveted literature accreditation, The Nobel Prize for Literature so late in life, for his masterpiece was quite obviously, 'The Grapes of Wrath' which he wrote when quite young.
John Steinbeck wrote serious novels, light-hearted stories such as Cannery Row, and even stage plays, e.g. The Moon is Down. A masterful storyteller, he was undoubtedly one of the best.