Curtis Brown (born April 18, 1960), better known by the stage names Grandmaster Caz and Casanova Fly, is an American rapper, songwriter, and DJ.

He is best known as the (uncredited) main writer of Big Bank Hank's raps on the seminal 1979 hip hop single by The Sugarhill Gang, "Rapper's Delight".

Grandmaster Caz is generally acknowledged to have been the main writer of the lyrics of Big Bank Hank (real name Henry Lee Jackson) on the 1979 The Sugarhill Gang single "Rapper's Delight", which sold around 5 million copies[9] and introduced hip hop music to the mainstream.

This is most evident in his opening verse, when, instead of introducing himself as Big Bank Hank, he raps, "Check it out, I'm the C-A-S-A-, N-O-V-A, and the rest is F-L-Y".

[15] In November 2021, Grandmaster Caz and female MC Sha-Rock started co-hosting the show That's The Joint on the Sirius XM channel Rock The Bells Radio, run by LL Cool J.

Artists who cite Grandmaster Caz as an influence include Will Smith,[17] Rakim, Big Daddy Kane[18] and Jay-Z.