Glenn Morshower is a character actor and motivational speaker who played Mike Chysler on The West Wing and is best known for playing Aaron Pierce on the TV program 24.
He regularly plays authority figures, with 22 roles as police or law enforcement officers, 21 roles as military personnel (including The West Wing) and 10 roles as government agents. He has been cast in several Michael Bay and Grant Heslov/George Clooney movies.