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