Robert Cooper Phillips, better known by his stage name Koopsta Knicca, is an American rapper. He is best known as one of original members of the Memphis rap group Three 6 Mafia. He is now a member of the new rap collective Da Mafia 6ix alongside DJ Paul, Gangsta Boo (no longer a group member as of April 2014) and Crunchy Black.

He released a solo album produced by DJ Paul, Da Devil's Playground in 1999. Cooper left Three 6 Mafia in 2000 because he was unable to make shows & videos being in trouble with the law. He has continued his solo work with albums Da K Project, De Inevitable, and The Mind of Robert Cooper. As of 2012, Cooper is working on his latest studio album entitled; "Da Devil's Playground 2" and also a mixtape entitled "Skrewged". He has also released A Murda 'N Room 8 EP (2010) & Decepticons "Return Of The Gods" (2012). Cooper also frequently collaborated with former Three 6 Mafia associate Lord Infamous and appeared on a collaborative album under the group name Da Mafia 6ix.