American rapper, songwriter, music producer, executive producer and entrepreneur. Throughout his career, he has used various spellings of his pseudonym: Jaÿ-Z, Jay Z and Jay:Z. He is the founder and co-owner of Roc-A-Fella Records and former CEO of Def Jam Recordings, co-owner of the 40/40 Club, founder of the Rocawear clothing line and co-owner of the NBA club Brooklyn Nets