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Appearances
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Guest cast, played by Leland Orser
- Episode 11x03: Try Carter (Oct 14, 2004)
- Episode 11x04: Fear (Oct 21, 2004)
- Episode 11x05: An Intern's Guide to the Galaxy (Nov 4, 2004)
- Episode 11x06: Time of Death (Nov 11, 2004)
- Episode 11x08: A Shot in the Dark (Dec 2, 2004)
- Episode 11x09: 'Twas the Night (Dec 9, 2004)
- Episode 11x11: Only Connect (Jan 20, 2005)
- Episode 11x12: The Providers (Jan 27, 2005)
- Episode 11x13: Middleman (Feb 3, 2005)
- Episode 11x14: Just As I Am (Feb 10, 2005)
- Episode 11x15: Alone in a Crowd (Feb 17, 2005)
- Episode 11x16: Here and There (Feb 24, 2005)
- Episode 11x17: Back in the World (Mar 24, 2005)
- Episode 11x19: Ruby Redux (Apr 28, 2005)
- Episode 11x20: You Are Here (May 5, 2005)
- Episode 11x22: The Show Must Go On (May 19, 2005)
- Episode 12x03: Man with No Name (Oct 6, 2005)
- Episode 12x04: Blame It on the Rain (Oct 13, 2005)
- Episode 12x05: Wake Up (Oct 20, 2005)
- Episode 12x06: Dream House (Nov 3, 2005)
- Episode 12x07: The Human Shield (Nov 10, 2005)
- Episode 12x09: I Do (Dec 1, 2005)
- Episode 12x12: Split Decisions (Jan 12, 2006)
- Episode 12x13: Body & Soul (Feb 2, 2006)
- Episode 12x14: Quintessence of Dust (Feb 9, 2006)
- Episode 12x17: Lost in America (Mar 23, 2006)
- Episode 12x21: The Gallant Hero & the Tragic Victor (May 11, 2006)
- Episode 13x01: Bloodline (Sep 21, 2006)
- Episode 13x03: Somebody to Love (Oct 5, 2006)
- Episode 13x06: Heart of the Matter (Nov 2, 2006)
- Episode 13x07: Jigsaw (Nov 9, 2006)
- Episode 13x11: City of Mercy (Dec 7, 2006)
- Episode 13x12: Breach of Trust (Jan 4, 2007)
- Episode 13x15: Dying Is Easy... (Feb 8, 2007)
- Episode 13x16: Crisis of Conscience (Feb 15, 2007)
- Episode 13x17: From Here to Paternity (Feb 22, 2007)
- Episode 13x18: Photographs and Memories (Apr 12, 2007)
- Episode 13x21: I Don't (May 3, 2007)
- Episode 13x22: Sea Change (May 10, 2007)
- Episode 14x01: The War Comes Home (Sep 27, 2007)
- Episode 14x02: In a Different Light (Oct 4, 2007)
- Episode 14x03: Officer Down (Oct 11, 2007)
- Episode 14x07: Blackout (Nov 8, 2007)
- Episode 14x09: Skye's the Limit (Nov 29, 2007)
- Episode 14x10: 300 Patients (Dec 6, 2007)
- Episode 14x13: Atonement (Jan 17, 2008)
- Episode 14x15: ...As the Day She Was Born (Apr 17, 2008)
- Episode 14x16: Truth Will Out (Apr 24, 2008)
- Episode 14x18: Tandem Repeats (May 8, 2008)
- Episode 14x19: The Chicago Way (May 15, 2008)
- Episode 15x01: Life After Death (Sep 25, 2008)
- Episode 15x02: Another Thursday at County (Oct 9, 2008)
- Episode 15x03: The Book of Abby (Oct 16, 2008)
- Episode 15x04: Parental Guidance (Oct 23, 2008)
- Episode 15x07: Heal Thyself (Nov 13, 2008)
- Episode 15x08: Age of Innocence (Nov 20, 2008)
- Episode 15x10: The High Holiday (Dec 11, 2008)
- Episode 15x12: Dream Runner (Jan 15, 2009)
- Episode 15x14: A Long, Strange Trip (Feb 5, 2009)
- Episode 15x17: T-minus-6 (Feb 26, 2009)
- Episode 15x20: Shifting Equilibrium (Mar 19, 2009)