One can only wonder how being a Marine Corps Vietnam vet and spending earning a living in the rough-and-tumble advertising industry shaped John Doman as an actor. Then again, it's probably no accident that the bulk of his roles have been no-nonsense characters with a mean streak. Doman played football at the University of Pennsylvania before getting out of the service and working on Madison Avenue for 20 years. During this time he took acting classes and performed in numerous Off-Off-Broadway productions. He made his first television appearance with a supporting part in the 1993 made-for-television drama "Empty Cradle." Over time, he's played construction workers ("Die Hard: With a Vengeance"), rapists ("Oz"), judges ("CSI: Crime Scene Investigation"), and a crooked CEO ("Damages"). But Doman's most memorable parts have been as grizzled Deputy Police Commissioner William A. Rawls on the 2002 HBO series "The Wire" and no-nonsense Chief of Psychiatry Dr. Carl Deraad in the long-running medical drama "ER."