Mark Singleton is a custom guitar maker and owner of Singleton Guitarworks. He started out in 1976 doing guitar repair at a guitar shop in New Haven Connecticut. In a quest to make a strat with a fatter tone he built a guitar using different  parts from around the shop. It had a 69 neck refretted with jumbo frets, and a very heavy 74 ash body, two Humbucking pickups, with a Bill Lawrence Blade. The guitar looked, played, and sounded great and became his main instrument. Later in the 1970s he heard that Santana was playing PRS guitars and eventually he got his own. The guitar looked and played great, but the tone he wanted wasn’t there. So he researched tone wood types, guitar building processes, pick up design, wood gluing, finishes. Then he started experimenting with several designs of his own: making many prototypes. He talked with various Southern California luthiers including Mark Lacey, John Carruthers , John Page, Don Grosh, and Tom Anderson. With input from all these great builders, in particular John Carruthers, he developed the current Singleton line of guitars.

Source: Singleton Guitarworks website (8 October 2022)