Manfred has written sixteen novels, seven "ruminations" (a word he uses to describe his semi-autobiographical works), two books of short stories, two books of poetry, and a collection of essays. He has also published conversations with John R. Milton, and his letters from 1932-1954 were collected and published in 1989. In 1951 he said, "I have approximately (and optimistically) but some seventy years to spend on this earth and I haven't got the time to waste if I want to come within a thousandth of living my potential". Those who know him are not surprised at what he has accomplished. By any standards (except maybe his own) Manfred has lived up to at least a thousandth of his potential, but prolific as he is, he has thus far not received the recognition he deserves.