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Mary McCormack

Cast & creator

Mary McCormack

1969-02-08 (age 57) Plainfield, New Jersey, USAIMDb

Best known for Watch What Happens Live with Andy Cohen, Law & Order, The Late Late Show with Craig Ferguson

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).

Also known as: Mary Catherine McCormack, مری مک‌کورمک

Movies

42

film credits

Series

37

television credits

Career

79

1956–2025 · acting roles

Credit score

6.1

average across scored titles

Signature credits

Known for

Ordered by popularity

Watch What Happens Live with Andy Cohen

Watch What Happens Live with Andy Cohen

Self - Guest · 2009

Law & Order

Law & Order

Rickie the Bartender · 1990

The Late Late Show with Craig Ferguson

The Late Late Show with Craig Ferguson

Self · 2005

Law & Order: Criminal Intent

Law & Order: Criminal Intent

Mary Shannon · 2001

Jimmy Kimmel Live!

Jimmy Kimmel Live!

Self · 2003

Across film & television

Filmography (79)

Search filmography

Showing 79 of 79 credits

Watch What Happens Live with Andy Cohen

Watch What Happens Live with Andy Cohen

Self - Guest

Law & Order

Law & Order

Rickie the Bartender

The Late Late Show with Craig Ferguson

The Late Late Show with Craig Ferguson

Self

Law & Order: Criminal Intent

Law & Order: Criminal Intent

Mary Shannon

Jimmy Kimmel Live!

Jimmy Kimmel Live!

Self

The West Wing

The West Wing

Kate Harper

The Pitt

The Pitt

Dr. Linda Conley

The Tonight Show with Jay Leno

The Tonight Show with Jay Leno

Scandal

Scandal

Lisa Elliot

ER

Debbie

The Ellen DeGeneres Show

The Ellen DeGeneres Show

Self

Tony Awards

Tony Awards

Self - Nominee

25 Words or Less

25 Words or Less

Self

25 Words or Less

25 Words or Less

25 Words or Less

25 Words or Less

Mary McCormack

Late Night with Jimmy Fallon

Late Night with Jimmy Fallon

Self

The Late Late Show with Craig Kilborn

The Late Late Show with Craig Kilborn

Self - Guest

In Plain Sight

In Plain Sight

Mary Shannon

Chelsea

Chelsea

Self

Angie Tribeca

Angie Tribeca

Abigail Liukin

The Newsroom

The Newsroom

Molly Levy

Murder One

Murder One

Justine Appleton

House of Lies

House of Lies

Denna Altshuler

To Tell the Truth

To Tell the Truth

Self - Panelist

Match Game

Match Game

Self - Panelist

Will & Grace

Will & Grace

Janet

For the People

For the People

Chloe Daniels

Divorce

Divorce

Kathy DeSantis

Deep Impact

Deep Impact

Andrea Baker

The L Word: Generation Q

The L Word: Generation Q

Anne Finley

Heels

Heels

Willie Day

K-PAX

K-PAX

Rachel Powell

1408

1408

Lilly Enslin

Miracle on 34th Street

Miracle on 34th Street

Myrna Foy

Welcome to the Family

Welcome to the Family

Caroline Yoder

K Street

K Street

Maggie Morris

True Crime

True Crime

Michelle Ziegler

Traffic

Traffic

Carole McKay

Vicious

Vicious

Mother

The Kids Are Alright

The Kids Are Alright

Peggy Cleary

54

New Year's Eve Wife (uncredited)

Private Parts

Private Parts

Alison Stern

Drone

Drone

Ellen

Gun Shy

Gun Shy

Gloria Nesstra

Full Frontal

Full Frontal

Linda

Dickie Roberts: Former Child Star

Dickie Roberts: Former Child Star

Grace Finney

Fathers' Day

Fathers' Day

Virginia Farrell (uncredited)

Scooby-Doo! WrestleMania Mystery

Scooby-Doo! WrestleMania Mystery

Ms. Richards (voice)

Mystery, Alaska

Mystery, Alaska

Donna Biebe

The Wright Verdicts

The Wright Verdicts

Beth Eckhart

Right at Your Door

Right at Your Door

Lexi

The Broken Hearts Club: A Romantic Comedy

The Broken Hearts Club: A Romantic Comedy

Anne

For Your Consideration

For Your Consideration

Pilgrim Woman

Treehouse

Treehouse

Lilith

Loaded

Loaded

Casey

Unpregnant

Unpregnant

Debra Clarke

High Heels and Low Lifes

High Heels and Low Lifes

Frances

The Crash

The Crash

Sarah Schwab

Still Laugh-In: The Stars Celebrate

Still Laugh-In: The Stars Celebrate

Self

Chelsea Does

Chelsea Does

Herself

Getting to Know You

Getting to Know You

Leila Lee

Backfire!

Backfire!

Sarah

Should've Been Romeo

Should've Been Romeo

Ellen

A Country Called Home

A Country Called Home

Amanda

Alien Code

Alien Code

Rebecca

Murder One: Diary of a Serial Killer

Murder One: Diary of a Serial Killer

Justine Appleton

Colin Fitz

Colin Fitz

Moira

An American Girl Story: Maryellen 1955 - Extraordinary Christmas

An American Girl Story: Maryellen 1955 - Extraordinary Christmas

Kay Larkin

National Memorial Day Concert

National Memorial Day Concert

Self

The Big Tease

The Big Tease

Monique

The Alarmist

The Alarmist

Sally

BigLove

BigLove

Phoebe

Escape from Polygamy

Escape from Polygamy

Leann

Madison

Madison

Bonnie McCormick

The Unprofessional

Hilary Pfeiffer-Dunne

World Traveler

World Traveler

Margaret

Other Voices

Other Voices

Anna

Harvest

Harvest

Agent Becka Anslinger

East of A

Daphne