- After spending years acting on the Chicago stage, moved to New York when a play he was in, Hauptmann, transferred to off-Broadway.
- Made his Broadway debut in Racing Demon in 1995.
- Originated the role of Mason Marzac in the play Take Me Out, opposite Daniel Sunjata.
- Has appeared on Law & Order, Law & Order: Special Victims Unit and Law & Order: Criminal Intent, playing different characters each time.
- Joined the cast of True Blood during the third season as Russell Edgington, the vampire king of Mississippi.
- 2003, Tony — Actor (Featured Role--Play): Winner
- 2008, Screen Actors Guild Awards — Outstanding Performance by a Cast in a Motion Picture: Nominee
- 2004, Tony — Actor (Featured Role--Musical): Nominee
- 2015, Emmy — Outstanding Supporting Actor In A Limited Series Or A Movie: Nominee
- 2012, Emmy — Outstanding Supporting Actor in a Miniseries or a Movie: Nominee
- 2013, Screen Actors Guild Awards — Outstanding Performance by a Cast in a Motion Picture: Nominee
- Hugo Redwood — Husband
- Karene O'Hare — Mother
- Derek Anson Jones — Ex-significant Other
- John O'Hare — Father
- Northwestern University, Evanston, Illinois, United States (1984)
- Birth Name: Denis Patrick Seamus O'Hare
- Birth Place: Kansas City, Missouri, United States
- Profession: Actor
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