Keith Cozart. Better known by his stage name Chief Keef, is a rapper and record producer from Chicago, Illinois. During his teenage years and while under house arrest, Keef's music videos were met with acclaim from local high school students. Increasing popularity led to his song "I Don't Like" to be remixed by Kayne West, Pusha T, Big Sean and others. Keef delivers what could possibly be his best work yet, with a hard hitting, diverse album.