Hermann Hauser guitars, and those made by his son Hermann Hauser II, have been extremely influential in the development of classical guitar and performance.
It’s hard to overstate the influence Hermann Hauser Senior and his son Hermann Hauser II had on the development of the classical guitar. Andres Segovia, Julian Bream, and many others used Hauser and Hauser II guitars extensively during their careers and these guitars can be heard on many recordings.