He mentions that several times in his book, and the answer is no. His only qualification is being an ex-stutterer. He has countless videos on youtube that have people sharing there story of how his methods helped cure there stutter. Seems pretty credible to me 🤷‍♂️ also, theres nothing wrong with trying his methods. I believe part of lee lovett is just an old rich guy who helps all these people just to boost his ego, but I also think his methods are genuine and are worth trying out.