Mary McCormack
"An iconic presence in cinema, defining characters with depth and intensity."
Age
57 years
Origin
USA
Active
1956 — Present
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).
History of the Legend
Witness the defining moments that shaped a legacy.
Law & Order
Starring as Rickie the Bartender
In cases ripped from the headlines, police investigate serious and often deadly crimes, weighing the evidence and questioning the suspects until someone is taken into custody. The district attorney's office then builds a case to convict the perpetrator by proving the person guilty beyond a reasonable doubt. Working together, these expert teams navigate all sides of the complex criminal justice system to make New York a safer place.
Highest Rated Masterpieces
The Pitt
as Dr. Linda Conley
The West Wing
as Kate Harper
The Newsroom
as Molly Levy
ER
as Debbie
The L Word: Generation Q
as Anne Finley
Law & Order: Criminal Intent
as Mary Shannon
Heels
as Willie Day
Law & Order
as Rickie the Bartender
Scooby-Doo! WrestleMania Mystery
as Ms. Richards (voice)
K-PAX
as Rachel Powell
Media Proof
Filmography Engine
76 Credits found
Vicious
Mother
2025
The Pitt
Dr. Linda Conley
2025
National Memorial Day Concert
Self
2023
Heels
Willie Day
2021
Unpregnant
Debra Clarke
2020
The L Word: Generation Q
Anne Finley
2019
Still Laugh-In: The Stars Celebrate
Self
2019
Treehouse
Lilith
2019
The Kids Are Alright
Peggy Cleary
2018
25 Words or Less
Self
2018
For the People
Chloe Daniels
2018
Will & Grace
Janet
2017
Drone
Ellen
2017
Loaded
Casey
2017
Alien Code
Rebecca
2017
Nobodies
Bitsy Hewitt-Bowles
2017
The Crash
Sarah Schwab
2017
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
Kay Larkin
2016
Divorce
Kathy DeSantis
2016
Match Game
Self - Panelist
2016
To Tell the Truth
Self - Panelist
2016
Chelsea
Self
2016
A Country Called Home
Amanda
2016
Chelsea Does
Herself
2016
Angie Tribeca
Abigail Liukin
2016
Scooby-Doo! WrestleMania Mystery
Ms. Richards (voice)
2014
Welcome to the Family
Caroline Yoder
2013
Escape from Polygamy
Leann
2013
The Newsroom
Molly Levy
2012
Should've Been Romeo
Ellen
2012
Scandal
Lisa Elliot
2012
House of Lies
Denna Altshuler
2012
Watch What Happens Live with Andy Cohen
Self - Guest
2009
Late Night with Jimmy Fallon
Self
2009
In Plain Sight
Mary Shannon
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
2005
Traffic
Carole McKay
2004
K Street
Maggie Morris
2003
The Ellen DeGeneres Show
Self
2003
Dickie Roberts: Former Child Star
Grace Finney
2003
Jimmy Kimmel Live!
Self
2003
Full Frontal
Linda
2002
World Traveler
Margaret
2002
K-PAX
Rachel Powell
2001
Law & Order: Criminal Intent
Mary Shannon
2001
High Heels and Low Lifes
Frances
2001
BigLove
Phoebe
2001
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
1999
The Late Late Show with Craig Kilborn
Self - Guest
1999
True Crime
Michelle Ziegler
1999
Harvest
Agent Becka Anslinger
1999