Mary McCormack

Known for

Acting

Born

February 8, 1969 (age 57)

Birthplace

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).

Best known work

1408

2007

Deep Impact

1998

K-PAX

2001

Miracle on 34th Street

1994

The Pitt

2025

ER

1994

True Crime

1999

The Newsroom

2012

Law & Order

1990

Scandal

2012

Filmography

2025
Vicious
as Mother
2025
The PittTV
as Dr. Linda Conley (2 episodes)
2023
National Memorial Day Concert
as Self
2021
HeelsTV
as Willie Day (16 episodes)
2020
Unpregnant
as Debra Clarke
2019
The L Word: Generation QTV
as Anne Finley (1 episode)
2019
Still Laugh-In: The Stars Celebrate
as Self
2019
Treehouse
as Lilith
2018
The Kids Are AlrightTV
as Peggy Cleary (23 episodes)
2018
25 Words or LessTV
as Self (26 episodes), as Mary McCormack (1 episode)
2018
For the PeopleTV
as Chloe Daniels (1 episode)
2017
Will & GraceTV
as Janet (2 episodes)
2017
Drone
as Ellen
2017
LoadedTV
as Casey (8 episodes)
2017
Alien Code
as Rebecca
2017
The Crash
as Sarah Schwab
2016
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
as Kay Larkin
2016
DivorceTV
as Kathy DeSantis (1 episode)
2016
Match GameTV
as Self - Panelist (1 episode)
2016
To Tell the TruthTV
as Self - Panelist (1 episode)
2016
ChelseaTV
as Self (2 episodes)
2016
A Country Called Home
as Amanda
2016
Chelsea DoesTV
as Herself (1 episode)
2016
Angie TribecaTV
as Abigail Liukin (3 episodes)
2014
Scooby-Doo! WrestleMania Mystery
as Ms. Richards (voice)