Joseph Stanley Williams is an American singer, songwriter and film score composer, best known as the lead vocalist of the rock band Toto from 1986 to 1988 and again since 2010. Williams is a son of actress Barbara Ruick and prolific film composer John Williams. Outside of Toto, he has worked as a composer and studio vocalist, including providing the singing voice of adult Simba in the 1994 animated film The Lion King.