Acting
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).
Filmography
Vicious
Film · 2025
The Pitt
Series · 2025
National Memorial Day Concert
Film · 2023
Heels
Series · 2021
Unpregnant
Film · 2020
Treehouse
Film · 2019
Still Laugh-In: The Stars Celebrate
Film · 2019
The L Word: Generation Q
Series · 2019
The Kids Are Alright
Series · 2018
For the People
Series · 2018
25 Words or Less
Series · 2018
25 Words or Less
Series · 2018
25 Words or Less
Series · 2018
The Crash
Film · 2017
Drone
Film · 2017
Alien Code
Film · 2017
Loaded
Series · 2017
Will & Grace
Series · 2017
A Country Called Home
Film · 2016
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
Film · 2016
Chelsea Does
Series · 2016
Chelsea
Series · 2016
Divorce
Series · 2016
Angie Tribeca
Series · 2016
Match Game
Series · 2016
To Tell the Truth
Series · 2016
Scooby-Doo! WrestleMania Mystery
Film · 2014
Escape from Polygamy
Film · 2013
Welcome to the Family
Series · 2013
Should've Been Romeo
Film · 2012
The Unprofessional
Film · 2012
House of Lies
Series · 2012
Scandal
Series · 2012
The Newsroom
Series · 2012
Watch What Happens Live with Andy Cohen
Series · 2009
Late Night with Jimmy Fallon
Series · 2009
In Plain Sight
Series · 2008
1408
Film · 2007
Right at Your Door
Film · 2006
For Your Consideration
Film · 2006
Madison
Film · 2005
The Late Late Show with Craig Ferguson
Series · 2005
Traffic
Series · 2004
Dickie Roberts: Former Child Star
Film · 2003
The Ellen DeGeneres Show
Series · 2003
K Street
Series · 2003
Jimmy Kimmel Live!
Series · 2003
Full Frontal
Film · 2002
World Traveler
Film · 2002
K-PAX
Film · 2001
High Heels and Low Lifes
Film · 2001
BigLove
Film · 2001
Law & Order: Criminal Intent
Series · 2001
The Broken Hearts Club: A Romantic Comedy
Film · 2000
Gun Shy
Film · 2000
Other Voices
Film · 2000
East of A
Film · 2000
The Big Tease
Film · 1999
Mystery, Alaska
Film · 1999
Harvest
Film · 1999
True Crime
Film · 1999
Getting to Know You
Film · 1999
The Late Late Show with Craig Kilborn
Series · 1999
The West Wing
Series · 1999
Deep Impact
Film · 1998
54
Film · 1998
The Alarmist
Film · 1998
Private Parts
Film · 1997
Colin Fitz
Film · 1997
Fathers' Day
Film · 1997
Murder One: Diary of a Serial Killer
Film · 1997
Backfire!
Film · 1995
Murder One
Series · 1995
The Wright Verdicts
Series · 1995
Miracle on 34th Street
Film · 1994
ER
Series · 1994
The Tonight Show with Jay Leno
Series · 1992
Law & Order
Series · 1990
Tony Awards
Series · 1956