Mary McCormack
Born
February 8, 1969 (age 56)
Birthplace
Plainfield, New Jersey, USA

Mary McCormack

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).

Movies

Vicious
Vicious
2025 ★ 6.0
Mother
Unpregnant
Unpregnant
2020 ★ 6.9
Debra Clarke
Treehouse
Treehouse
2019 ★ 5.5
Lilith
Drone
Drone
2017 ★ 5.3
Ellen
Alien Code
Alien Code
2017 ★ 5.4
Rebecca
The Crash
The Crash
2017 ★ 4.5
Sarah Schwab
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
2016 ★ 7.8
Kay Larkin
A Country Called Home
A Country Called Home
2016 ★ 5.3
Amanda
Scooby-Doo! WrestleMania Mystery
Scooby-Doo! WrestleMania Mystery
2014 ★ 7.3
Ms. Richards (voice)
Escape from Polygamy
Escape from Polygamy
2013 ★ 6.8
Leann
Should've Been Romeo
Should've Been Romeo
2012 ★ 4.3
Ellen
The Unprofessional
The Unprofessional
2012
Hilary Pfeiffer-Dunne
1408
1408
2007 ★ 6.7
Lilly Enslin
For Your Consideration
For Your Consideration
2006 ★ 5.7
Pilgrim Woman
Right at Your Door
Right at Your Door
2006 ★ 5.8
Lexi
Madison
Madison
2005 ★ 5.7
Bonnie McCormick
Dickie Roberts: Former Child Star
Dickie Roberts: Former Child Star
2003 ★ 5.1
Grace Finney
Full Frontal
Full Frontal
2002 ★ 4.6
Linda
World Traveler
World Traveler
2002 ★ 3.9
Margaret
K-PAX
K-PAX
2001 ★ 7.2
Rachel Powell
High Heels and Low Lifes
High Heels and Low Lifes
2001 ★ 6.1
Frances
BigLove
BigLove
2001 ★ 6.7
Phoebe
East of A
East of A
2000
Daphne
Gun Shy
Gun Shy
2000 ★ 5.2
Gloria Nesstra
The Broken Hearts Club: A Romantic Comedy
The Broken Hearts Club: A Romantic Comedy
2000 ★ 6.2
Anne
Other Voices
Other Voices
2000 ★ 3.5
Anna
The Big Tease
The Big Tease
1999 ★ 5.7
Monique
Mystery, Alaska
Mystery, Alaska
1999 ★ 6.3
Donna Biebe
True Crime
True Crime
1999 ★ 6.5
Michelle Ziegler
Harvest
Harvest
1999 ★ 3.0
Agent Becka Anslinger
Getting to Know You
Getting to Know You
1999 ★ 7.5
Leila Lee
The Alarmist
The Alarmist
1998 ★ 4.4
Sally
54
54
1998 ★ 5.9
New Year's Eve Wife (uncredited)
Deep Impact
Deep Impact
1998 ★ 6.2
Andrea Baker
Murder One: Diary of a Serial Killer
Murder One: Diary of a Serial Killer
1997
Justine Appleton
Fathers' Day
Fathers' Day
1997 ★ 5.5
Virginia Farrell (uncredited)
Private Parts
Private Parts
1997 ★ 6.4
Alison Stern
Colin Fitz
Colin Fitz
1997 ★ 5.0
Moira
Backfire!
Backfire!
1995 ★ 3.0
Sarah Jackson
Miracle on 34th Street
Miracle on 34th Street
1994 ★ 6.7
Myrna Foy

TV Series

Heels
Heels
2021 ★ 7.4
Willie Day
16 Episodes
The L Word: Generation Q
The L Word: Generation Q
2019 ★ 7.6
Anne Finley
1 Episode
The Kids Are Alright
The Kids Are Alright
2018 ★ 6.9
Peggy Cleary
23 Episodes
25 Words or Less
25 Words or Less
2018 ★ 5.2
15 Episodes
For The People
For The People
2018 ★ 7.3
Chloe Daniels
1 Episode
Will & Grace
Will & Grace
2017 ★ 7.5
Janet
2 Episodes
Loaded
Loaded
2017 ★ 6.6
Casey
8 Episodes
Divorce
Divorce
2016 ★ 6.4
Kathy DeSantis
1 Episode
Angie Tribeca
Angie Tribeca
2016 ★ 6.4
Abigail Liukin
3 Episodes
Welcome to the Family
Welcome to the Family
2013 ★ 5.3
Caroline Yoder
9 Episodes
The Newsroom
The Newsroom
2012 ★ 8.1
Molly Levy
2 Episodes
Scandal
Scandal
2012 ★ 7.2
Lisa Elliot
1 Episode
House of Lies
House of Lies
2012 ★ 6.6
Denna Altshuler
7 Episodes
In Plain Sight
In Plain Sight
2008 ★ 7.0
Mary Shannon
61 Episodes
Traffic
Traffic
2004 ★ 5.8
Carole McKay
3 Episodes
K Street
K Street
2003 ★ 4.6
Maggie Morris
10 Episodes
Law & Order: Criminal Intent
Law & Order: Criminal Intent
2001 ★ 7.6
Mary Shannon
1 Episode
The West Wing
The West Wing
1999 ★ 8.2
Kate Harper
48 Episodes
Murder One
Murder One
1995 ★ 7.8
Justine Appleton
41 Episodes
The Wright Verdicts
The Wright Verdicts
1995
Beth Eckhart
7 Episodes
ER
ER
1994 ★ 7.8
Debbie
6 Episodes
The Tonight Show with Jay Leno
The Tonight Show with Jay Leno
1992 ★ 5.4
1 Episode
Law & Order
Law & Order
1990 ★ 7.4
Rickie the Bartender
1 Episode