He's certainly been around a long time. I liked his excellent work in the 60s with the Clark Terry/Bob Brookmeyer quintet and on More Blues and the Abstract Truth. I recall reading in a book on jazz piano that as a technique to alter sound Kellaway would move his fingers on keys already depressed. Not sure if I can hear this on the records!
Now finished it. Full of fascinating information and recommended without reservation. Having read it, though, I think a more accurate subtitle would have been "The Man Who Used Jazz to Make Money".