Who wrote the first barber manual?

A.B. Moler is recognized as the author of the first barber manual, a significant contribution to the profession that formalized barbering techniques and standards. His work played an essential role in elevating the profession by providing educational resources for barbers. Moler's manual not only offered practical guidance for various barbering skills but also contributed to the establishment of barber schools, thus helping to professionalize the field. The impact of this manual can still be felt today as it set the groundwork for barbering education and practices in the United States.