Jason Christopher Medeiros better known as Mr. J. Medeiros, is an American rapper, record producer, and songwriter. As well as releasing music under the name, Mr. J. Medeiros, he is responsible for forming the Hip Hop group The Procussions, is one half of the Hip Hop/Electronic duo AllttA, and the lead singer of Punk-Rap group thebandknives. He is of Portuguese and Scottish descent. Mr. J. has written music with such artists as 20Syl and French hip hop group Hocus Pocus (group), George "Spanky" McCurdy, Thomas Pridgen, Aaron Spears, Noel Zancanella, Randy Jackson, Marty James, Monte Nueble, Møme, Talib Kweli, Symbolyc One (S1), Illmind, Benny Cassette, and Caravan Palace, among others.