Home Musical artists Mario Caldato Jr. Mario Caldato Jr. Musical artist Mario Caldato, Jr. (also known as Mario C.) is an American record producer and studio engineer best known for his work with the Beastie Boys and Tone Loc. Personal facts Alias (AKA)Mario C. Birth dateFebruary 24, 1961 Birth placeBrazil , São Paulo facebook tumblr linkedin twitter reddit google+ Search Musical artist associated musical artistBeastie Boys BackgroundNon performing personnel instrumentBass guitarKeyboard instrument Mario Caldato Jr. on Wikipedia Mario Caldato Jr.