Karl Sandoval is an American luthier who started out working at Fender in the 1970s before moving on to the Charvel Custom Shop. In 1979 he launched his own business. He's best known for his custom polka-dot flying V electric made for Randy Rhoads, but he also made guitars for Eddie Van Halen and George Lynch.

Source: Sandoval Engineering website (14 July 2020)