Mary McCormack
Born
February 8, 1969 (56 years old)
Known For
Acting
Place of Birth
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 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).
Vicious
2025
National Memorial Day Concert
Self
2023
Heels
Willie Day · (16 episodes)
2021
Unpregnant
Debra Clarke
2020
The L Word: Generation Q
Anne Finley · (1 episode)
2019
Still Laugh-In: The Stars Celebrate
Self
2019
Treehouse
Lilith
2019
The Kids Are Alright
Peggy Cleary · (23 episodes)
2018
25 Words or Less
Self · (15 episodes)
2018
25 Words or Less
(11 episodes)
2018
For The People
Chloe Daniels · (1 episode)
2018
Will & Grace
Janet · (2 episodes)
2017
Drone
Ellen
2017
Loaded
Casey · (8 episodes)
2017
Alien Code
Rebecca
2017
The Crash
Sarah Schwab
2017
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
Kay Larkin
2016
Divorce
Kathy DeSantis · (1 episode)
2016
Match Game
Self - Panelist · (1 episode)
2016
To Tell the Truth
Self - Panelist · (1 episode)
2016
Chelsea
Self · (2 episodes)
2016
A Country Called Home
Amanda
2016
Chelsea Does
Herself · (1 episode)
2016
Angie Tribeca
Abigail Liukin · (3 episodes)
2016
Scooby-Doo! WrestleMania Mystery
Ms. Richards (voice)
2014
Welcome to the Family
Caroline Yoder · (9 episodes)
2013
Escape from Polygamy
Leann
2013
The Newsroom
Molly Levy · (2 episodes)
2012
Should've Been Romeo
Ellen
2012
Scandal
Lisa Elliot · (1 episode)
2012
House of Lies
Denna Altshuler · (7 episodes)
2012
The Unprofessional
Hilary Pfeiffer-Dunne
2012
Watch What Happens Live with Andy Cohen
Self - Guest · (1 episode)
2009
Late Night with Jimmy Fallon
Self · (1 episode)
2009
In Plain Sight
Mary Shannon · (61 episodes)
2008
1408
Lilly Enslin
2007
For Your Consideration
Pilgrim Woman
2006
Right at Your Door
Lexi
2006
Madison
Bonnie McCormick
2005
The Late Late Show with Craig Ferguson
Self · (2 episodes)
2005
Traffic
Carole McKay · (3 episodes)
2004
K Street
Maggie Morris · (10 episodes)
2003
The Ellen DeGeneres Show
Self · (1 episode)
2003
Dickie Roberts: Former Child Star
Grace Finney
2003
Full Frontal
Linda
2002
World Traveler
Margaret
2002
K-PAX
Rachel Powell
2001
Law & Order: Criminal Intent
Mary Shannon · (1 episode)
2001
High Heels and Low Lifes
Frances
2001
BigLove
Phoebe
2001
East of A
Daphne
2000
Gun Shy
Gloria Nesstra
2000
The Broken Hearts Club: A Romantic Comedy
Anne
2000
Other Voices
Anna
2000
The Big Tease
Monique
1999
Mystery, Alaska
Donna Biebe
1999
The West Wing
Kate Harper · (48 episodes)
1999
The Late Late Show with Craig Kilborn
Self - Guest · (2 episodes)
1999
True Crime
Michelle Ziegler
1999
Harvest
Agent Becka Anslinger
1999
Getting to Know You
Leila Lee
1999
The Alarmist
Sally
1998
54
New Year's Eve Wife (uncredited)
1998
Deep Impact
Andrea Baker
1998
Fathers' Day
Virginia Farrell (uncredited)
1997
Private Parts
Alison Stern
1997
Colin Fitz
Moira
1997
Murder One
Justine Appleton · (41 episodes)
1995
The Wright Verdicts
Beth Eckhart · (7 episodes)
1995
Backfire!
Sarah Jackson
1995
Miracle on 34th Street
Myrna Foy
1994
ER
Debbie · (6 episodes)
1994
The Tonight Show with Jay Leno
(1 episode)
1992
Law & Order
Rickie the Bartender · (1 episode)
1990
Tony Awards
Self - Nominee · (1 episode)
1956