Mekhi Phifer (; born December 29, 1974) is an American actor. He portrayed Dr.
Greg Pratt on
NBC's long-running medical drama
ER and had a co-starring role opposite
Eminem in the feature film
8 Mile. He was a regular on the
Fox crime show
Lie to Me in the role of Ben Reynolds, before season three, and also starred as CIA agent
Rex Matheson in .