Mary McCormack

Person

Mary McCormack

Acting 57 February 8, 1969

Plainfield, New Jersey, USA

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 Harpe…

IMDb

Known for

Popular titles

Law & Order

Law & Order

7.3 1990 TV Show
Watch What Happens Live with Andy Cohen

Watch What Happens Live with Andy Cohen

4.9 2009 TV Show
1408

1408

6.7 2007 Movie
The Late Late Show with Craig Ferguson

The Late Late Show with Craig Ferguson

6.8 2005 TV Show
Deep Impact

Deep Impact

6.3 1998 Movie
K-PAX

K-PAX

7.2 2001 Movie
The Late Late Show with Craig Kilborn

The Late Late Show with Craig Kilborn

5.3 1999 TV Show
Law & Order: Criminal Intent

Law & Order: Criminal Intent

7.6 2001 TV Show
The Pitt

The Pitt

8.7 2025 TV Show
Jimmy Kimmel Live!

Jimmy Kimmel Live!

5.3 2003 TV Show
ER

ER

7.8 1994 TV Show
The West Wing

The West Wing

8.3 1999 TV Show

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Biography

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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).

Filmography

Movies and shows, newest first

  1. 2025
    Vicious

    Movie Mother

  2. 2025
    The Pitt

    TV show Dr. Linda Conley

  3. 2023
    National Memorial Day Concert

    Movie Self

  4. 2021
    Heels

    TV show Willie Day

  5. 2020
    Unpregnant

    Movie Debra Clarke

  6. 2019
    The L Word: Generation Q

    TV show Anne Finley

  7. 2019
    Still Laugh-In: The Stars Celebrate

    Movie Self

  8. 2019
    Treehouse

    Movie Lilith

  9. 2018
    The Kids Are Alright

    TV show Peggy Cleary

  10. 2018
    25 Words or Less

    TV show Self

  11. 2018
    For the People

    TV show Chloe Daniels

  12. 2017
    Will & Grace

    TV show Janet

  13. 2017
    Drone

    Movie Ellen

  14. 2017
    Loaded

    TV show Casey

  15. 2017
    Alien Code

    Movie Rebecca

  16. 2017
    The Crash

    Movie Sarah Schwab

More credits
  1. 2016
    An American Girl Story: Maryellen 1955 - Extraordinary Christmas

    Movie Kay Larkin

  2. 2016
    Divorce

    TV show Kathy DeSantis

  3. 2016
    Match Game

    TV show Self - Panelist

  4. 2016
    To Tell the Truth

    TV show Self - Panelist

  5. 2016
    Chelsea

    TV show Self

  6. 2016
    A Country Called Home

    Movie Amanda

  7. 2016
    Chelsea Does

    TV show Herself

  8. 2016
    Angie Tribeca

    TV show Abigail Liukin

  9. 2014
    Scooby-Doo! WrestleMania Mystery

    Movie Ms. Richards (voice)

  10. 2013
    Welcome to the Family

    TV show Caroline Yoder

  11. 2013
    Escape from Polygamy

    Movie Leann

  12. 2012
    The Newsroom

    TV show Molly Levy

  13. 2012
    Should've Been Romeo

    Movie Ellen

  14. 2012
    Scandal

    TV show Lisa Elliot

  15. 2012
    House of Lies

    TV show Denna Altshuler

  16. 2012
    The Unprofessional

    Movie Hilary Pfeiffer-Dunne

  17. 2009
    Watch What Happens Live with Andy Cohen

    TV show Self - Guest

  18. 2009
    Late Night with Jimmy Fallon

    TV show Self

  19. 2008
    In Plain Sight

    TV show Mary Shannon

  20. 2007
    1408

    Movie Lilly Enslin

  21. 2006
    For Your Consideration

    Movie Pilgrim Woman

  22. 2006
    Right at Your Door

    Movie Lexi

  23. 2005
    Madison

    Movie Bonnie McCormick

  24. 2005
    The Late Late Show with Craig Ferguson

    TV show Self