Mario Garrone was born in 1932. As an entrepreneur, he managed a metallurgic and mechanic company, producing goods for houses. This helped him gain an extensive knowledge of the physics of materials and metallurgy. For years, he spent a lot of time as a radio-amateur, learning from that experience the basics of electricity and electronics. Simultaneously, he learned how to build violins and guitars by himself or from other luthiers – historical or contemporary. Today, his instruments are highly prized, and are played by professional musicians as well as students at musical academies. He is the author of the book ‘La Costruzione della Chitarra Classica’ (Bèrben 1994) in Italian. He is married and has two children. Giuseppe Cuzzucoli has degrees in Electronic Engineering and Information Science, from Politecnico di Torino and Università di Torino, respectively, and he has developed electronic systems for the automotive industry. He has also devoted himself to the guitar – his instrument of his choice – and has explored its history, music, literature, and acoustics. He now works full time on the physics of the guitar. He is the author of the book ‘Fisica della Chitarra Classica’ (Create Space Independent Publishing – 2018) in Italian and of a number of papers on the physical model of the classical guitar. He is married, with one daughter.