American pop and reggaeton singer who was part of the duo Arcangel & De La Ghetto. He became a solo artist in 2006.
He first joined the duo with Arcángel in 2004 and released the debut single "Pegate" in 2005.
He took his stage name from the episode "Def Poet's Society" of the television series The Fresh Prince of Bel-Air.
He was born Rafael Castillo and raised with a Dominican father and Puerto Rican mother in San Juan, Puerto Rico.