Mary McCormack
Known for acting · Born 8 February 1969 · 57 · Plainfield, New Jersey, USA
77 credits
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
The West Wing
1999
K-PAX
2001
In Plain Sight
2008
Private Parts
1997
Vicious
2025
Drone
2017
Mystery, Alaska
1999
Right at Your Door
2006
Murder One
1995
Dickie Roberts: Former Child Star
2003
Heels
2021
Acting (77)
2025The PittDr. Linda Conley · 2 episodesSeries
2025ViciousMotherFilm
2023National Memorial Day ConcertSelfFilm
2021HeelsWillie Day · 16 episodesSeries
2020UnpregnantDebra ClarkeFilm
2019The L Word: Generation QAnne FinleySeries
2019TreehouseLilithFilm
2019Still Laugh-In: The Stars CelebrateSelfFilm
2018For the PeopleChloe DanielsSeries
2018The Kids Are AlrightPeggy Cleary · 23 episodesSeries
201825 Words or LessSelf · 26 episodes, · 19 episodes, Mary McCormackSeries
2017DroneEllenFilm
2017Will & GraceJanet · 2 episodesSeries
2017Alien CodeRebeccaFilm
2017The CrashSarah SchwabFilm
2017LoadedCasey · 8 episodesSeries
2016Angie TribecaAbigail Liukin · 3 episodesSeries
2016ChelseaSelf · 2 episodesSeries
2016DivorceKathy DeSantisSeries
2016A Country Called HomeAmandaFilm
2016Match GameSelf - PanelistSeries
2016Chelsea DoesHerselfSeries
2016An American Girl Story: Maryellen 1955 - Extraordinary ChristmasKay LarkinFilm
2016To Tell the TruthSelf - PanelistSeries
2014Scooby-Doo! WrestleMania MysteryMs. Richards (voice)Film
2013Escape from PolygamyLeannFilm
2013Welcome to the FamilyCaroline Yoder · 9 episodesSeries
2012The NewsroomMolly Levy · 2 episodesSeries
2012ScandalLisa ElliotSeries
2012House of LiesDenna Altshuler · 7 episodesSeries
2012Should've Been RomeoEllenFilm
2012The UnprofessionalHilary Pfeiffer-DunneFilm
2009Late Night with Jimmy FallonSelfSeries
2009Watch What Happens Live with Andy CohenSelf - GuestSeries
2008In Plain SightMary Shannon · 61 episodesSeries
20071408Lilly EnslinFilm
2006Right at Your DoorLexiFilm
2006For Your ConsiderationPilgrim WomanFilm
2005The Late Late Show with Craig FergusonSelf · 2 episodesSeries
2005MadisonBonnie McCormickFilm
2004TrafficCarole McKay · 3 episodesSeries
2003Jimmy Kimmel Live!SelfSeries
2003Dickie Roberts: Former Child StarGrace FinneyFilm
2003The Ellen DeGeneres ShowSelfSeries
2003K StreetMaggie Morris · 10 episodesSeries
2002Full FrontalLindaFilm
2002World TravelerMargaretFilm
2001K-PAXRachel PowellFilm
2001Law & Order: Criminal IntentMary ShannonSeries
2001High Heels and Low LifesFrancesFilm
2001BigLovePhoebeFilm
2000Gun ShyGloria NesstraFilm
2000The Broken Hearts Club: A Romantic ComedyAnneFilm
2000Other VoicesAnnaFilm
2000East of ADaphneFilm
1999True CrimeMichelle ZieglerFilm
1999The West WingKate Harper · 48 episodesSeries
1999Mystery, AlaskaDonna BiebeFilm
1999The Big TeaseMoniqueFilm
1999The Late Late Show with Craig KilbornSelf - Guest · 2 episodesSeries
1999Getting to Know YouLeila LeeFilm
1999HarvestAgent Becka AnslingerFilm
1998Deep ImpactAndrea BakerFilm
199854New Year's Eve Wife (uncredited)Film
1998The AlarmistSallyFilm
1997Private PartsAlison SternFilm
1997Fathers' DayVirginia Farrell (uncredited)Film
1997Colin FitzMoiraFilm
1997Murder One: Diary of a Serial KillerJustine AppletonFilm
1995Murder OneJustine Appleton · 41 episodesSeries
1995Backfire!SarahFilm
1995The Wright VerdictsBeth Eckhart · 7 episodesSeries
1994Miracle on 34th StreetMyrna FoyFilm
1994ERDebbie · 6 episodesSeries
1992The Tonight Show with Jay LenoSeries
1990Law & OrderRickie the BartenderSeries
1956Tony AwardsSelf - NomineeSeries