Clark Johnson (born September 10, 1954) is an American-Canadian actor and director who has worked in both television and film. He is best known for his roles as David Jefferson in Night Heat (1985–1988), Clark Roberts in E.N.G. (1989–1994), Meldrick Lewis in Homicide: Life on the Street (1993–1999), and Augustus Haynes in The Wire (2008). He is an Emmy Award and two-time Genie Award nominee.