Mary McCormack

Actor Feb 8 (age 57) Plainfield, New Jersey, USA 1990–2025 (35 year career)

6.0 avg rating

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

Film

K-PAX

Rachel Powell

Film

1408

Lilly Enslin

Film

The West Wing

Kate Harper

Film

Deep Impact

Andrea Baker

Film

Miracle on 34th Street

Myrna Foy

Film

True Crime

Michelle Ziegler

Film

Scooby-Doo! WrestleMania Mystery

Ms. Richards (voice)

Film

Unpregnant

Debra Clarke

Filmography

Acting (76)

Movies (42)

Vicious

2025

as Mother

6.0

National Memorial Day Concert

as Self

Unpregnant

as Debra Clarke

Treehouse

as Lilith

Still Laugh-In: The Stars Celebrate

as Self

Drone

as Ellen

The Crash

as Sarah Schwab

Alien Code

as Rebecca

An American Girl Story: Maryellen 1955 - Extraordinary Christmas

2016

as Kay Larkin

7.8

A Country Called Home

2016

as Amanda

5.3

Scooby-Doo! WrestleMania Mystery

2014

as Ms. Richards (voice)

Escape from Polygamy

as Leann

The Unprofessional

as Hilary Pfeiffer-Dunne

Should've Been Romeo

as Ellen

1408

as Lilly Enslin

For Your Consideration

as Pilgrim Woman

Right at Your Door

as Lexi

Madison

as Bonnie McCormick

Dickie Roberts: Former Child Star

as Grace Finney

Full Frontal

as Linda

World Traveler

as Margaret

K-PAX

as Rachel Powell

BigLove

as Phoebe

High Heels and Low Lifes

as Frances

Gun Shy

as Gloria Nesstra

Other Voices

as Anna

The Broken Hearts Club: A Romantic Comedy

2000

as Anne

6.2

East of A

2000

as Daphne

True Crime

1999

as Michelle Ziegler

6.5

Harvest

1999

as Agent Becka Anslinger

Mystery, Alaska

as Donna Biebe

The Big Tease

as Monique

Getting to Know You

as Leila Lee

Deep Impact

as Andrea Baker

as New Year's Eve Wife (uncredited)

The Alarmist

as Sally

Private Parts

as Alison Stern

Fathers' Day

as Virginia Farrell (uncredited)

5.5

Colin Fitz

1997

as Moira

5.0

Murder One: Diary of a Serial Killer

1997

as Justine Appleton

Backfire!

1995

as Sarah Jackson

3.0

Miracle on 34th Street

1994

as Myrna Foy

6.8

Television (34)

Heels

2021

as Willie Day

7.4

The L Word: Generation Q

as Anne Finley

25 Words or Less

as Self

For the People

as Chloe Daniels

The Kids Are Alright

as Peggy Cleary

Will & Grace

as Janet

Loaded

as Casey

Angie Tribeca

as Abigail Liukin

Chelsea

as Self

Divorce

as Kathy DeSantis

To Tell the Truth

as Self - Panelist

Match Game

as Self - Panelist

Chelsea Does

as Herself

Welcome to the Family

as Caroline Yoder

Scandal

as Lisa Elliot

House of Lies

as Denna Altshuler

The Newsroom

as Molly Levy

Watch What Happens Live with Andy Cohen

2009

as Self - Guest

5.1

Late Night with Jimmy Fallon

as Self

In Plain Sight

as Mary Shannon

The Late Late Show with Craig Ferguson

as Self

Traffic

as Carole McKay

The Ellen DeGeneres Show

as Self

K Street

as Maggie Morris

Law & Order: Criminal Intent

as Mary Shannon

The West Wing

as Kate Harper

The West Wing

as Kate Harper

The Late Late Show with Craig Kilborn

as Self - Guest

Murder One

as Justine Appleton

The Wright Verdicts

as Beth Eckhart

as Debbie

The Tonight Show with Jay Leno

1992

5.4

Law & Order

1990

as Rickie the Bartender

7.3

Tony Awards

1956

as Self - Nominee

5.9