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