curtis brown (born april 18, 1961), better known by his stage name casanova fly a.k.a grandmaster caz, is an american rapper, songwriter and dj. he currently works as a celebrity tour guide for hush hip hop tours, a hip-hop cultural sightseeing tour company in new york city, and is a board member of the kennedy center's hip-hop council, hip-hop ambassador and board member for windows of hiphop and ceo of gmc entertainment inc.