Yasiin Bey (; born Dante Terrell Smith Bey; December 11, 1973), better known by his former stage name Mos Def , is an American hip hop recording artist, actor, comedian, and activist from Brooklyn, New York City, New York. Best known for his music, Bey embarked on his hip hop career in 1994, alongside his siblings in the short-lived rap group Urban Thermo Dynamics (UTD), after which he appeared on albums by Da Bush Babees and De La Soul. He subsequently formed the trio Black Star, alongside fellow Brooklyn-based rapper Talib Kweli, and Cincinnati producer Hi-Tek and released their eponymous debut album in 1998. He was a major force in late-1990s underground hip hop while under Rawkus Records. In 1999, Bey released his solo debut, Black on Both Sides, under Rawkus and Priority Records. His debut was followed by The New Danger (2004), True Magic (2006) and The Ecstatic (2009).