Glynn Russell Turman (born January 31, 1947) is an
American stage, television, and film actor as well as a writer, director, and producer. He is known for his roles as high school student Leroy "Preach" Jackson in the 1975
coming-of-age film
Cooley High, math professor and retired Army colonel Bradford Taylor on the
NBC sitcom
A Different World, and fictional Baltimore mayor
Clarence Royce on the
HBO drama series
The Wire. Glynn is recently playing Jeremiah Kaan on the
Showtime series
House of Lies.