Mark Christopher Lawrence (born May 22, 1964) is an American character actor, stand-up comedian and voice-over artist. He is known for his role as esoteric D.J., Tone Def, in the 1994 satirical rap documentary, Fear of a Black Hat. He has appeared in popular films such as Terminator 2: Judgment Day, Tales From the Hood, Planet of the Apes, Lost Treasure and The Pursuit of Happiness.
Lawrence is best known for his role as Big Mike on the NBC series Chuck. He has made guest appearances on many television programs, most notably Heroes, My Name Is Earl, Crossing Jordan, Dharma & Greg, Malcolm in the Middle, Touched by an Angel, Malcolm & Eddie, Men Behaving Badly, Seinfeld, Murphy Brown, Good Luck Charlie and Martin. He is also featured on the Radio Series Adventures in Odyssey as "Ed Washington".