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Personal Info
Known For
Acting
Birthday
February 8, 1969
Place of Birth
Plainfield, New Jersey, USA
Also Known As
- Mary Catherine McCormack
- مری مککورمک
Mary McCormack
1.3 Popularity
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
6.0
Mother
Vicious
2025
2.0
Self
National Memorial Day Concert
2023
7.4
Willie Day
Heels
2021
6.9
Debra Clarke
Unpregnant
2020
7.6
Anne Finley
The L Word: Generation Q
2019
5.3
Self
Still Laugh-In: The Stars Celebrate
2019
5.5
Lilith
Treehouse
2019
6.9
Peggy Cleary
The Kids Are Alright
2018
5.2
Self
25 Words or Less
2018
5.2
25 Words or Less
2018
Credits
Vicious
as Mother
2025
6.0
National Memorial Day Concert
as Self
2023
2.0
Heels
as Willie Day
2021
7.4
Unpregnant
as Debra Clarke
2020
6.9
The L Word: Generation Q
as Anne Finley
2019
7.6
Still Laugh-In: The Stars Celebrate
as Self
2019
5.3
Treehouse
as Lilith
2019
5.5
The Kids Are Alright
as Peggy Cleary
2018
6.9
25 Words or Less
as Self
2018
5.2
25 Words or Less
2018
5.2
25 Words or Less
as Mary McCormack
2018
5.2
For The People
as Chloe Daniels
2018
7.3
Will & Grace
as Janet
2017
7.5
Drone
as Ellen
2017
5.3
Loaded
as Casey
2017
6.6
Alien Code
as Rebecca
2017
5.4
The Crash
as Sarah Schwab
2017
4.5
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
as Kay Larkin
2016
7.8
Divorce
as Kathy DeSantis
2016
6.4
Match Game
as Self - Panelist
2016
6.4
To Tell the Truth
as Self - Panelist
2016
6.2
Chelsea
as Self
2016
5.1
A Country Called Home
as Amanda
2016
5.3
Chelsea Does
as Herself
2016
5.3
Angie Tribeca
as Abigail Liukin
2016
6.4
Scooby-Doo! WrestleMania Mystery
as Ms. Richards (voice)
2014
7.3
Welcome to the Family
as Caroline Yoder
2013
5.3
Escape from Polygamy
as Leann
2013
6.8
The Newsroom
as Molly Levy
2012
8.1
Should've Been Romeo
as Ellen
2012
4.3
Scandal
as Lisa Elliot
2012
7.2
House of Lies
as Denna Altshuler
2012
6.6
🎬
The Unprofessional
as Hilary Pfeiffer-Dunne
2012
0.0
Watch What Happens Live with Andy Cohen
as Self - Guest
2009
5.1
Late Night with Jimmy Fallon
as Self
2009
6.1
In Plain Sight
as Mary Shannon
2008
7.0
1408
as Lilly Enslin
2007
6.7
For Your Consideration
as Pilgrim Woman
2006
5.7
Right at Your Door
as Lexi
2006
5.8
Madison
as Bonnie McCormick
2005
5.7
The Late Late Show with Craig Ferguson
as Self
2005
6.7
Traffic
as Carole McKay
2004
5.8
K Street
as Maggie Morris
2003
4.6
The Ellen DeGeneres Show
as Self
2003
5.6
Dickie Roberts: Former Child Star
as Grace Finney
2003
5.1
Full Frontal
as Linda
2002
4.6
World Traveler
as Margaret
2002
3.9
K-PAX
as Rachel Powell
2001
7.2
Law & Order: Criminal Intent
as Mary Shannon
2001
7.6
High Heels and Low Lifes
as Frances
2001
6.1
BigLove
as Phoebe
2001
6.7
🎬
East of A
as Daphne
2000
0.0
Gun Shy
as Gloria Nesstra
2000
5.2
The Broken Hearts Club: A Romantic Comedy
as Anne
2000
6.2
Other Voices
as Anna
2000
3.5
The Big Tease
as Monique
1999
5.7
Mystery, Alaska
as Donna Biebe
1999
6.3
The West Wing
as Kate Harper
1999
8.2
The Late Late Show with Craig Kilborn
as Self - Guest
1999
4.6
True Crime
as Michelle Ziegler
1999
6.5
Harvest
as Agent Becka Anslinger
1999
3.0
Getting to Know You
as Leila Lee
1999
7.5
The Alarmist
as Sally
1998
4.4
54
as New Year's Eve Wife (uncredited)
1998
5.9
Deep Impact
as Andrea Baker
1998
6.2
Murder One: Diary of a Serial Killer
as Justine Appleton
1997
0.0
Fathers' Day
as Virginia Farrell (uncredited)
1997
5.5
Private Parts
as Alison Stern
1997
6.4
Colin Fitz
as Moira
1997
5.0
Murder One
as Justine Appleton
1995
7.8
The Wright Verdicts
as Beth Eckhart
1995
0.0
Backfire!
as Sarah Jackson
1995
3.0
Miracle on 34th Street
as Myrna Foy
1994
6.7
ER
as Debbie
1994
7.8
The Tonight Show with Jay Leno
1992
5.4
Law & Order
as Rickie the Bartender
1990
7.4
Tony Awards
as Self - Nominee
1956
5.9