Steven Williams (born January 7, 1949) is an American actor in films and television. Williams was born in Memphis, Tennessee, and raised in Chicago, where he worked as a postal carrier, salesman, and model. He is known for his roles as Captain Adam Fuller on 21 Jump Street, Lt. Jefferson Burnett on The Equalizer, Det. August Brooks on L. A. Heat, X on The X-Files, Russell "Linc" Lincoln in Linc's, and Rufus Turner in Supernatural.