Person
Mary McCormack
Acting · Born 1969-02-08 · Plainfield, New Jersey, USA
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
Law & Order
Rickie the Bartender
Watch What Happens Live with Andy Cohen
Self - Guest
The Pitt
Dr. Linda Conley
Law & Order: Criminal Intent
Mary Shannon
The West Wing
Kate Harper
ER
Debbie
The Late Late Show with Craig Ferguson
Self
Scandal
Lisa Elliot
Jimmy Kimmel Live!
Self
Tony Awards
Self - Nominee
Filmography
- 2025ViciousMother
- 2025The PittDr. Linda Conley
- 2023National Memorial Day ConcertSelf
- 2021HeelsWillie Day
- 2020UnpregnantDebra Clarke
- 2019The L Word: Generation QAnne Finley
- 2019Still Laugh-In: The Stars CelebrateSelf
- 2019TreehouseLilith
- 2018The Kids Are AlrightPeggy Cleary
- 201825 Words or LessSelf
- 2018For the PeopleChloe Daniels
- 2017Will & GraceJanet
- 2017DroneEllen
- 2017LoadedCasey
- 2017Alien CodeRebecca
- 2017The CrashSarah Schwab
- 2016An American Girl Story: Maryellen 1955 - Extraordinary ChristmasKay Larkin
- 2016DivorceKathy DeSantis
- 2016Match GameSelf - Panelist
- 2016To Tell the TruthSelf - Panelist
- 2016ChelseaSelf
- 2016A Country Called HomeAmanda
- 2016Chelsea DoesHerself
- 2016Angie TribecaAbigail Liukin
- 2014Scooby-Doo! WrestleMania MysteryMs. Richards (voice)
- 2013Welcome to the FamilyCaroline Yoder
- 2013Escape from PolygamyLeann
- 2012The NewsroomMolly Levy
- 2012Should've Been RomeoEllen
- 2012ScandalLisa Elliot
- 2012House of LiesDenna Altshuler
- 2012The UnprofessionalHilary Pfeiffer-Dunne
- 2009Watch What Happens Live with Andy CohenSelf - Guest
- 2009Late Night with Jimmy FallonSelf
- 2008In Plain SightMary Shannon
- 20071408Lilly Enslin
- 2006For Your ConsiderationPilgrim Woman
- 2006Right at Your DoorLexi
- 2005MadisonBonnie McCormick
- 2005The Late Late Show with Craig FergusonSelf
- 2004TrafficCarole McKay
- 2003K StreetMaggie Morris
- 2003The Ellen DeGeneres ShowSelf
- 2003Dickie Roberts: Former Child StarGrace Finney
- 2003Jimmy Kimmel Live!Self
- 2002Full FrontalLinda
- 2002World TravelerMargaret
- 2001K-PAXRachel Powell
- 2001Law & Order: Criminal IntentMary Shannon
- 2001High Heels and Low LifesFrances
- 2001BigLovePhoebe
- 2000East of ADaphne
- 2000Gun ShyGloria Nesstra
- 2000The Broken Hearts Club: A Romantic ComedyAnne
- 2000Other VoicesAnna
- 1999The Big TeaseMonique
- 1999Mystery, AlaskaDonna Biebe
- 1999The West WingKate Harper
- 1999The Late Late Show with Craig KilbornSelf - Guest
- 1999True CrimeMichelle Ziegler
- 1999HarvestAgent Becka Anslinger
- 1999Getting to Know YouLeila Lee
- 1998The AlarmistSally
- 199854New Year's Eve Wife (uncredited)
- 1998Deep ImpactAndrea Baker
- 1997Murder One: Diary of a Serial KillerJustine Appleton
- 1997Fathers' DayVirginia Farrell (uncredited)
- 1997Private PartsAlison Stern
- 1997Colin FitzMoira
- 1995Murder OneJustine Appleton
- 1995The Wright VerdictsBeth Eckhart
- 1995Backfire!Sarah
- 1994Miracle on 34th StreetMyrna Foy
- 1994ERDebbie
- 1992The Tonight Show with Jay Leno
- 1990Law & OrderRickie the Bartender
- 1956Tony AwardsSelf - Nominee
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