Born in Plainfield, New Jersey, USA — Feb 08 1969
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).
Browse acting and crew credits across movies and TV — filter and sort to find specific roles.

Rickie the Bartender

Kate Harper

Mary Shannon

Lisa Elliot

Debbie

Janet

Self

Molly Levy

Abigail Liukin

Justine Appleton

Mary Shannon

Denna Altshuler

Self - Panelist

Self - Panelist

Chloe Daniels

Anne Finley

Kathy DeSantis

Andrea Baker

Maggie Morris

Willie Day

Rachel Powell

Lilly Enslin

Myrna Foy

Caroline Yoder

Carole McKay

Mother

Peggy Cleary

Michelle Ziegler

Casey

Alison Stern

New Year's Eve Wife (uncredited)

Ellen

Linda

Gloria Nesstra

Beth Eckhart

Anne

Pilgrim Woman

Virginia Farrell (uncredited)

Lilith

Bonnie McCormick

Donna Biebe

Moira

Grace Finney

Ms. Richards (voice)

Frances

Sarah Schwab

Debra Clarke

Sally

Monique

Amanda

Herself

Rebecca

Agent Becka Anslinger

Self
Hilary Pfeiffer-Dunne

Justine Appleton

Sarah
Daphne

Anna

Margaret

Phoebe

Leila Lee

Lexi

Self

Kay Larkin

Ellen

Leann

Self - Nominee