The famous psychiatrist and psychologist Milton Erickson founded the American Society for Clinical Hypnosis. It is his works that most heavily influenced the field of NLP and brief therapy.
In his life he overcame dyslexia, and recovered from near paralyzing polio. His own life struggles gave him a special insight into how the mind works, which he used to help people until his demise in 1980.
His works and approaches are known as Ericksonian hypnosis, and have added huge value to hypnosis methods today.