- His father worked for the Metropolitan Opera.
- Made acting debut in an ABC Afterschool Special at age 7.
- Starred as Joey in the Broadway revival of The Homecoming in 1991.
- Briefly considered a career as a police officer but pursued acting instead. He joined the cast of Homicide: Life on the Street as Detective Mike Kellerman in 1995.
- Was introduced as a regular on The Shield when it debuted in 2002, but his character, Detective Terry Crowley, was killed in the series opener.
- Along with the rest of the cast, was nominated for a 2006 Screen Actors Guild Award for Outstanding Performance by a Cast in a Motion Picture for Good Night, and Good Luck.
- 2005, Screen Actors Guild Awards — Outstanding Performance by a Cast in a Motion Picture: Nominee
- Marnie McPhail — Wife
- Michelle Forbes — Ex-significant Other
- Allison Diamond — Mother
- Kristin Davis — Ex-significant Other
- Frederika Kesten — Ex-wife
- Bob Diamond — Father
- Attended University of North Carolina, Chapel Hill, North Carolina, United States; The Juilliard School, New York, New York, United States