Anyone know who this doctor referenced is or where I/we can get more information?

Anyone know who this doctor referenced is or where I/we can get more information? I just ran into a new book from John Hendrickson and in the blurb on amazon it says: > Along the way, Hendrickson guides us through the evolution of speech therapy, the controversial quest for a “magic pill” to end stuttering, and the burgeoning self-help movement within the stuttering community. Beyond his own experiences, he shares portraits of fellow stutterers who have changed his life, and he writes about *a pioneering doctor who is upending the field of speech therapy*. Anyone know who the "pioneering doctor" is or more information about their "upending the field of speech therapy"? Sounds like the book doesn't come out for almost another year.