The singer Maynard James Keenan 's birth name is James Herbert Keenan .
Maynard James Keenan ( born Joe Dale LaFon III ; April 17 , 1964 ) , often referred to by his initials MJK , is an American progressive metal singer , songwriter , musician , record producer , winemaker , and actor , best known as the vocalist for Grammy Award-winning American progressive metal band Tool .
Maynard James Keenan