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 mockumentary, Fear of a Black Hat. He has co-starred in popular films such as Terminator 2: Judgment Day, Tales From the Hood, Planet of the Apes, Lost Treasure and The Pursuit of Happyness.Lawrence is best known for his role as Big Mike on the NBC series Chuck.