My first impression was that he was perhaps a "fringe" doctor, one of those who think they've solved some common problem but they can't get other doctors to listen to them. But the more I read, the more I became convinced that he really knows what he's talking about and has solid research studies to back up his opinions. And my doctor was the one who recommended his book. I'm sure his approach will become more and more mainstream in the next few years.
I have been recommending this book to all my perimenopausal and menopausal friends and they have been as excited by it as I am.