What are Laura Doyle's qualifications? The website says "Author, Lecturer and Seminar Leader" and "marketing copywriter. She is a graduate with honors from San Jose State University's journalism department."
She is not a mental health professional as far as I am aware. She has simply written about what has worked for her. She was in a failing marriage, hit rock bottom, took a 12 step approach and applied it in a marital context and turned things around.
I come from a family of mental health "professionals" (certified psychologists and psychiatrists) and none of them practice what they preach; they are as fcuked up as anyone you could imagine. Which is not to say that it is not possible to achieve real healing with a professional (which I did), but being a professional does not necessarily mean they have applied their wisdom effectively in their own lives.
To respond to geeta's point about a book for husbands (which is related to this point), I don't believe she does. Her approach is not to preach, which writing to a male population would involve. Her approach is to reveal her issues, her pain, and what she found that was effective - simply to share what worked for her.