Mary McCormack
Acting
Born: February 8, 1969 (age 57) · Plainfield, New Jersey, USA
Highest Rated
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).
Known for
1408
2007
Deep Impact
1998
K-PAX
2001
Miracle on 34th Street
1994
ER
1994
True Crime
1999
The Pitt
2025
The Newsroom
2012
Law & Order
1990
Scandal
2012
The West Wing
1999
54
1998
Photos (4)
Movies (38)
Deep Impact
Andrea Baker
1408
Lilly Enslin
K-PAX
Rachel Powell
Miracle on 34th Street
Myrna Foy
True Crime
Michelle Ziegler
54
New Year's Eve Wife (uncredited)
Vicious
Mother
Drone
Ellen
Dickie Roberts: Former Child Star
Grace Finney
Scooby-Doo! WrestleMania Mystery
Ms. Richards (voice)
Fathers' Day
Virginia Farrell (uncredited)
Full Frontal
Linda
Gun Shy
Gloria Nesstra
Private Parts
Alison Stern
Right at Your Door
Lexi
Mystery, Alaska
Donna Biebe
Unpregnant
Debra Clarke
High Heels and Low Lifes
Frances
The Broken Hearts Club: A Romantic Comedy
Anne
Treehouse
Lilith
For Your Consideration
Pilgrim Woman
Should've Been Romeo
Ellen
Getting to Know You
Leila Lee
The Crash
Sarah Schwab
Alien Code
Rebecca
Murder One: Diary of a Serial Killer
Justine Appleton
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
Kay Larkin
A Country Called Home
Amanda
Backfire!
Sarah
The Big Tease
Monique
BigLove
Phoebe
The Alarmist
Sally
World Traveler
Margaret
Madison
Bonnie McCormick
Escape from Polygamy
Leann
Harvest
Agent Becka Anslinger
Other Voices
Anna
Colin Fitz
Moira
TV Shows (25)
Law & Order
Rickie the Bartender · 1 eps
Law & Order: Criminal Intent
Mary Shannon · 1 eps
The Pitt
Dr. Linda Conley · 2 eps
The West Wing
Kate Harper · 48 eps
ER
Debbie · 6 eps
The Tonight Show with Jay Leno
1 eps
Scandal
Lisa Elliot · 1 eps
25 Words or Less
19 eps
25 Words or Less
Mary McCormack · 1 eps
In Plain Sight
Mary Shannon · 61 eps
Angie Tribeca
Abigail Liukin · 3 eps
The Newsroom
Molly Levy · 2 eps
Murder One
Justine Appleton · 41 eps
Will & Grace
Janet · 2 eps
House of Lies
Denna Altshuler · 7 eps
Divorce
Kathy DeSantis · 1 eps
For the People
Chloe Daniels · 1 eps
The L Word: Generation Q
Anne Finley · 1 eps
Heels
Willie Day · 16 eps
The Kids Are Alright
Peggy Cleary · 23 eps
K Street
Maggie Morris · 10 eps
Welcome to the Family
Caroline Yoder · 9 eps
Traffic
Carole McKay · 3 eps
The Wright Verdicts
Beth Eckhart · 7 eps
Loaded
Casey · 8 eps
Self / Appearances (14)
Watch What Happens Live with Andy Cohen
Self - Guest · 1 eps
The Late Late Show with Craig Ferguson
Self · 2 eps
Jimmy Kimmel Live!
Self · 1 eps
The Ellen DeGeneres Show
Self · 1 eps
25 Words or Less
Self · 26 eps
Tony Awards
Self - Nominee · 1 eps
Late Night with Jimmy Fallon
Self · 1 eps
Chelsea
Self · 2 eps
The Late Late Show with Craig Kilborn
Self - Guest · 2 eps
To Tell the Truth
Self - Panelist · 1 eps
Match Game
Self - Panelist · 1 eps
Still Laugh-In: The Stars Celebrate
Self
National Memorial Day Concert
Self
Chelsea Does
Herself · 1 eps