Mary McCormack
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).
Personal Details
Also Known As
Movies (25)
Vicious
as Mother
2025
National Memorial Day Concert
as Self
2023
Unpregnant
as Debra Clarke
2020
Still Laugh-In: The Stars Celebrate
as Self
2019
Treehouse
as Lilith
2019
Drone
as Ellen
2017
Alien Code
as Rebecca
2017
The Crash
as Sarah Schwab
2017
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
as Kay Larkin
2016
A Country Called Home
as Amanda
2016
Scooby-Doo! WrestleMania Mystery
as Ms. Richards (voice)
2014
Escape from Polygamy
as Leann
2013
Should've Been Romeo
as Ellen
2012
The Unprofessional
as Hilary Pfeiffer-Dunne
2012
1408
as Lilly Enslin
2007
For Your Consideration
as Pilgrim Woman
2006
Right at Your Door
as Lexi
2006
Madison
as Bonnie McCormick
2005
Dickie Roberts: Former Child Star
as Grace Finney
2003
Full Frontal
as Linda
2002
World Traveler
as Margaret
2002
K-PAX
as Rachel Powell
2001
High Heels and Low Lifes
as Frances
2001
BigLove
as Phoebe
2001
East of A
as Daphne
2000
TV Shows (25)
Heels
as Willie Day
2021
The L Word: Generation Q
as Anne Finley
2019
The Kids Are Alright
as Peggy Cleary
2018
25 Words or Less
as Self
2018
For the People
as Chloe Daniels
2018
Will & Grace
as Janet
2017
Loaded
as Casey
2017
Divorce
as Kathy DeSantis
2016
Match Game
as Self - Panelist
2016
To Tell the Truth
as Self - Panelist
2016
Chelsea
as Self
2016
Chelsea Does
as Herself
2016
Angie Tribeca
as Abigail Liukin
2016
Welcome to the Family
as Caroline Yoder
2013
The Newsroom
as Molly Levy
2012
Scandal
as Lisa Elliot
2012
House of Lies
as Denna Altshuler
2012
Watch What Happens Live with Andy Cohen
as Self - Guest
2009
Late Night with Jimmy Fallon
as Self
2009
In Plain Sight
as Mary Shannon
2008
The Late Late Show with Craig Ferguson
as Self
2005
Traffic
as Carole McKay
2004
K Street
as Maggie Morris
2003
The Ellen DeGeneres Show
as Self
2003
Law & Order: Criminal Intent
as Mary Shannon
2001