Mary McCormack
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).
Notable Works
Prominent titles featuring Mary McCormack
Filmography
Acting (42)
2025
Viciousas Mother
6.0
2023
2.0
2020
Unpregnantas Debra Clarke
6.8
2019
5.3
2019
Treehouseas Lilith
5.5
2017
Droneas Ellen
5.3
2017
Alien Codeas Rebecca
5.4
2017
The Crashas Sarah Schwab
4.5
2016
7.8
2016
A Country Called Homeas Amanda
5.3
2014
Scooby-Doo! WrestleMania Mysteryas Ms. Richards (voice)
7.3
2013
Escape from Polygamyas Leann
6.7
2012
Should've Been Romeoas Ellen
3.8
2012
The Unprofessionalas Hilary Pfeiffer-Dunne
2.0
2007
1408as Lilly Enslin
6.7
2006
For Your Considerationas Pilgrim Woman
5.8
2006
Right at Your Dooras Lexi
5.8
2005
Madisonas Bonnie McCormick
5.8
2003
Dickie Roberts: Former Child Staras Grace Finney
5.1
2002
Full Frontalas Linda
4.6
2002
World Traveleras Margaret
4.1
2001
K-PAXas Rachel Powell
7.2
2001
High Heels and Low Lifesas Frances
6.1
2001
BigLoveas Phoebe
7.5
2000
East of Aas Daphne
10.0
2000
Gun Shyas Gloria Nesstra
5.2
2000
6.3
2000
Other Voicesas Anna
4.0
1999
The Big Teaseas Monique
5.9
1999
Mystery, Alaskaas Donna Biebe
6.3
1999
True Crimeas Michelle Ziegler
6.5
1999
Harvestas Agent Becka Anslinger
4.3
1999
Getting to Know Youas Leila Lee
7.6
1998
The Alarmistas Sally
4.5
1998
54as New Year's Eve Wife (uncredited)
5.9
1998
Deep Impactas Andrea Baker
6.3
1997
Murder One: Diary of a Serial Killeras Justine Appleton
7.0
1997
Fathers' Dayas Virginia Farrell (uncredited)
5.5
1997
Private Partsas Alison Stern
6.5
1997
Colin Fitzas Moira
6.3
1995
Backfire!as Sarah
3.4
1994
Miracle on 34th Streetas Myrna Foy
6.8