The book "The Talking Deaf Man: A Proposed Method By Which One Who Was Born Deaf Can Learn To Speak" by the famous author Johann Konrad Ammann is a very interesting scientific study on the development of speech in people who were born deaf. Thanks to the inventions and methods proposed by the author, the book became an important breakthrough in pedagogy for people with hearing impairments. Amman tried to figure out how to solve the problem of the inability to speak in the deaf, using his observations and analysis. This book contributed to the development of speech teaching methods for the hearing impaired and opened new horizons in language rehabilitation research.