Glynn Russell Turman (born January 31, 1947) is an American stage, television, and film actor as well as a writer, director, and producer. Turman is known for his roles as Lew Miles on the prime-time soap opera Peyton Place (1968–69), 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 (1988–93), and fictional Baltimore mayor Clarence Royce on the HBO drama series The Wire. He recently portrayed Jeremiah Kaan on the Showtime series House of Lies.