Mary McCormack
Acting
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
Acting77
movieVicious
2025
Mother
tvThe Pitt
2025
Dr. Linda Conley
tvHeels
2021
Willie Day
movieUnpregnant
2020
Debra Clarke
tvThe L Word: Generation Q
2019
Anne Finley
movieTreehouse
2019
Lilith
tvThe Kids Are Alright
2018
Peggy Cleary
tv25 Words or Less
2018
Self / Mary McCormack
tvFor the People
2018
Chloe Daniels
tvWill & Grace
2017
Janet
movieDrone
2017
Ellen
tvLoaded
2017
Casey
movieAlien Code
2017
Rebecca
movieThe Crash
2017
Sarah Schwab
tvDivorce
2016
Kathy DeSantis
tvMatch Game
2016
Self - Panelist
tvTo Tell the Truth
2016
Self - Panelist
tvChelsea
2016
Self
tvChelsea Does
2016
Herself
tvAngie Tribeca
2016
Abigail Liukin
movieScooby-Doo! WrestleMania Mystery
2014
Ms. Richards (voice)
tvWelcome to the Family
2013
Caroline Yoder
tvThe Newsroom
2012
Molly Levy
tvScandal
2012
Lisa Elliot
tvHouse of Lies
2012
Denna Altshuler
The Unprofessional
2012
Hilary Pfeiffer-Dunne
tvWatch What Happens Live with Andy Cohen
2009
Self - Guest
tvIn Plain Sight
2008
Mary Shannon
movie1408
2007
Lilly Enslin
movieFor Your Consideration
2006
Pilgrim Woman
movieMadison
2005
Bonnie McCormick
tvTraffic
2004
Carole McKay
tvK Street
2003
Maggie Morris
movieDickie Roberts: Former Child Star
2003
Grace Finney
movieWorld Traveler
2002
Margaret
movieK-PAX
2001
Rachel Powell
tvLaw & Order: Criminal Intent
2001
Mary Shannon
movieBigLove
2001
Phoebe
movieGun Shy
2000
Gloria Nesstra
movieThe Big Tease
1999
Monique
movieMystery, Alaska
1999
Donna Biebe
tvThe West Wing
1999
Kate Harper
tvThe Late Late Show with Craig Kilborn
1999
Self - Guest
movieTrue Crime
1999
Michelle Ziegler
movieHarvest
1999
Agent Becka Anslinger
movieGetting to Know You
1999
Leila Lee
movie54
1998
New Year's Eve Wife (uncredited)
movieDeep Impact
1998
Andrea Baker
movieMurder One: Diary of a Serial Killer
1997
Justine Appleton
movieFathers' Day
1997
Virginia Farrell (uncredited)
moviePrivate Parts
1997
Alison Stern
movieColin Fitz
1997
Moira
tvMurder One
1995
Justine Appleton
tvThe Wright Verdicts
1995
Beth Eckhart
movieBackfire!
1995
Sarah
movieMiracle on 34th Street
1994
Myrna Foy
tvER
1994
Debbie
tvLaw & Order
1990
Rickie the Bartender
tvTony Awards
1956
Self - Nominee