HCRI clients include individuals from all walks of life, such as teachers, business professionals, athletes, students, broadcasters, engineers, musicians, doctors, military personnel, police officers, actors, a Supreme Court nominee, and even royalty. The transforming impact of HCRI stuttering therapy can be seen in the before-and-after videos below. Research demonstrates 93% of HCRI therapy participants achieve fluent speech by the end of their 12-day program. When evaluated two years after treatment, 75% sustained their fluency skills.