I am one of those people. I am a speech pathologist who is also a lifelong stutterer. I always felt ashamed and embarrassed by my stuttering. I decided to do research on how I can become fluent. I asked myself the question as to why fluent speakers don’t stutter. I discovered it has to do with the fact that when speaking they have a steady flow of air through the vocal cords. Whereas a stutterer has poor or intermittent airflow which I found was the root cause of stuttering. When a stutterer talks and only mouths the words without voice they do not stutter. I spent a long time teaching my brain on how to maintain consistent airflow. This allowed me to become fluent. Over the course of time I was able to transform my stuttering brain into fluent brain. I no longer stutter and I have never had a relapse. Checkout the books by William Parry who discusses the Valsalva response or research it online. This is what started my pathway to fluency.