Rafal Turkowiak (born 1966) is a Polish maker of classical and acoustic guitars. He made his first guitar at the age of 17 and went on to build many more. During his long career his experience and experiments in guitar making have resulted in several innovations. His WAVE type resonator is applied in the sound board of all of his instruments. He has also invented a way to produce sound from the guitar neck by using acoustic tubes inside the neck. His bridges have drilled holes to reduce mass. He also uses a special press to shape and curve his guitar back and sides. His sons Tymoteusz Turkowiak and Nikodem Turkowiak are also luthiers:

Source: Rafal Turkowiak Guitars website (14 October 2022)