Acting
Mary McCormack
Born 1969-02-08
Plainfield, New Jersey, USA
Department: Acting
Biography
Mary Catherine McCormack is an American actress. She has had leading roles as Justine Appleton on the series Murder One (1995–1997), as Deputy National Security Adviser Kate Harper on The West Wing (2004–2006), as Deputy U.S. Marshal Mary Shannon on In Plain Sight (2008–2012), and as Peggy on the comedy series The Kids Are Alright (2018–2019).
Known For
Prominent works featuring Mary McCormack
Movie
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1408
2007
TMDB3.4
TV
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Watch What Happens Live with Andy Cohen
2009
TMDB2.5
Movie
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Deep Impact
1998
TMDB3.1
TV
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Law & Order
1990
TMDB3.6
Movie
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K-PAX
2001
TMDB3.6
TV
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The Pitt
2025
TMDB4.3
TV
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ER
1994
TMDB3.9
TV
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The West Wing
1999
TMDB4.2
Movie
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Miracle on 34th Street
1994
TMDB3.4
TV
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Law & Order: Criminal Intent
2001
TMDB3.8
Filmography & Credits
Complete career catalog (79 titles)
| Poster | Title | Character / Role | Type | Year |
|---|---|---|---|---|
 | Vicious | Mother | Movie | 2025 |
 | The Pitt | Dr. Linda Conley | TV Series | 2025 |
 | National Memorial Day Concert | Self | Movie | 2023 |
 | Heels | Willie Day | TV Series | 2021 |
 | Unpregnant | Debra Clarke | Movie | 2020 |
 | The L Word: Generation Q | Anne Finley | TV Series | 2019 |
 | Still Laugh-In: The Stars Celebrate | Self | Movie | 2019 |
 | Treehouse | Lilith | Movie | 2019 |
 | The Kids Are Alright | Peggy Cleary | TV Series | 2018 |
 | 25 Words or Less | Self | TV Series | 2018 |
| 25 Words or Less | Self / Appearance | TV Series | 2018 |
| 25 Words or Less | Mary McCormack | TV Series | 2018 |
 | For the People | Chloe Daniels | TV Series | 2018 |
 | Will & Grace | Janet | TV Series | 2017 |
 | Drone | Ellen | Movie | 2017 |
 | Loaded | Casey | TV Series | 2017 |
 | Alien Code | Rebecca | Movie | 2017 |
 | The Crash | Sarah Schwab | Movie | 2017 |
 | An American Girl Story: Maryellen 1955 - Extraordinary Christmas | Kay Larkin | Movie | 2016 |
 | Divorce | Kathy DeSantis | TV Series | 2016 |
 | Match Game | Self - Panelist | TV Series | 2016 |
 | To Tell the Truth | Self - Panelist | TV Series | 2016 |
 | Chelsea | Self | TV Series | 2016 |
 | A Country Called Home | Amanda | Movie | 2016 |
 | Chelsea Does | Herself | TV Series | 2016 |
 | Angie Tribeca | Abigail Liukin | TV Series | 2016 |
 | Scooby-Doo! WrestleMania Mystery | Ms. Richards (voice) | Movie | 2014 |
 | Welcome to the Family | Caroline Yoder | TV Series | 2013 |
 | Escape from Polygamy | Leann | Movie | 2013 |
 | The Newsroom | Molly Levy | TV Series | 2012 |
 | Should've Been Romeo | Ellen | Movie | 2012 |
 | Scandal | Lisa Elliot | TV Series | 2012 |
 | House of Lies | Denna Altshuler | TV Series | 2012 |
| The Unprofessional | Hilary Pfeiffer-Dunne | Movie | 2012 | |
 | Watch What Happens Live with Andy Cohen | Self - Guest | TV Series | 2009 |
 | Late Night with Jimmy Fallon | Self | TV Series | 2009 |
 | In Plain Sight | Mary Shannon | TV Series | 2008 |
 | 1408 | Lilly Enslin | Movie | 2007 |
 | For Your Consideration | Pilgrim Woman | Movie | 2006 |
 | Right at Your Door | Lexi | Movie | 2006 |
 | Madison | Bonnie McCormick | Movie | 2005 |
 | The Late Late Show with Craig Ferguson | Self | TV Series | 2005 |
 | Traffic | Carole McKay | TV Series | 2004 |
 | K Street | Maggie Morris | TV Series | 2003 |
 | The Ellen DeGeneres Show | Self | TV Series | 2003 |
 | Dickie Roberts: Former Child Star | Grace Finney | Movie | 2003 |
 | Jimmy Kimmel Live! | Self | TV Series | 2003 |
 | Full Frontal | Linda | Movie | 2002 |
 | World Traveler | Margaret | Movie | 2002 |
 | K-PAX | Rachel Powell | Movie | 2001 |
 | Law & Order: Criminal Intent | Mary Shannon | TV Series | 2001 |
 | High Heels and Low Lifes | Frances | Movie | 2001 |
 | BigLove | Phoebe | Movie | 2001 |
| East of A | Daphne | Movie | 2000 | |
 | Gun Shy | Gloria Nesstra | Movie | 2000 |
 | The Broken Hearts Club: A Romantic Comedy | Anne | Movie | 2000 |
 | Other Voices | Anna | Movie | 2000 |
 | The Big Tease | Monique | Movie | 1999 |
 | Mystery, Alaska | Donna Biebe | Movie | 1999 |
 | The West Wing | Kate Harper | TV Series | 1999 |
 | The Late Late Show with Craig Kilborn | Self - Guest | TV Series | 1999 |
 | True Crime | Michelle Ziegler | Movie | 1999 |
 | Harvest | Agent Becka Anslinger | Movie | 1999 |
 | Getting to Know You | Leila Lee | Movie | 1999 |
 | The Alarmist | Sally | Movie | 1998 |
 | 54 | New Year's Eve Wife (uncredited) | Movie | 1998 |
 | Deep Impact | Andrea Baker | Movie | 1998 |
 | Murder One: Diary of a Serial Killer | Justine Appleton | Movie | 1997 |
 | Fathers' Day | Virginia Farrell (uncredited) | Movie | 1997 |
 | Private Parts | Alison Stern | Movie | 1997 |
 | Colin Fitz | Moira | Movie | 1997 |
 | Murder One | Justine Appleton | TV Series | 1995 |
 | The Wright Verdicts | Beth Eckhart | TV Series | 1995 |
 | Backfire! | Sarah | Movie | 1995 |
 | Miracle on 34th Street | Myrna Foy | Movie | 1994 |
 | ER | Debbie | TV Series | 1994 |
 | The Tonight Show with Jay Leno | Self / Appearance | TV Series | 1992 |
 | Law & Order | Rickie the Bartender | TV Series | 1990 |
 | Tony Awards | Self - Nominee | TV Series | 1956 |