Strictly speaking her main instrument is viola, not violin. (People with soloist ambitions tend to choose violin over viola, but most teachers and orchestra professionals don't aspire to solo careers and prefer not spending their lives on tour like so many soloists or they are simply team players rather than individualists.) Her primary calling seems to be teaching, not performing, though she has recorded some albums and played in professional orchestras. She has also studied neuroscience, but not performed or published any studies of her own afaik. She spent the past decade as university viola professor consecutively at two different universities, but her current position is as a teacher of the science to practice at the New England Conservatory of Music.
I don't think the best performers are usually the best teachers or communicators, and I applaud the New England Conservatory for having a position with a meta level approach to music practice. While I agree that several practice methods she recommends are in no way new, I don't know of anyone else who has gone through recent neurological studies on learning, as well as experiments on athletes, surgeons in training etc and applied the findings to instrument practice and published a book in layman terms. But it won't suit everybody. I'm guessing she's mainly targeting people like her own previous students who are aiming for professional careers and need to make the most of their practice time in order to be competitive in auditions etc.