
Acting
February 7, 1969 (56 years old)
Plainfield, New Jersey, USA
Also Known As
Mary Catherine McCormack
مری مککورمک
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).

Vicious
2025
as Mother

National Memorial Day Concert
2023
as Self

Heels
2021
as Willie Day

Unpregnant
2020
as Debra Clarke

The L Word: Generation Q
2019
as Anne Finley

Still Laugh-In: The Stars Celebrate
2019
as Self

Treehouse
2019
as Lilith

The Kids Are Alright
2018
as Peggy Cleary

25 Words or Less
2018
as Self

25 Words or Less
2018

25 Words or Less
2018
as Mary McCormack

For the People
2018
as Chloe Daniels

Will & Grace
2017
as Janet

Drone
2017
as Ellen

Loaded
2017
as Casey

Alien Code
2017
as Rebecca

The Crash
2017
as Sarah Schwab

An American Girl Story: Maryellen 1955 - Extraordinary Christmas
2016
as Kay Larkin

Divorce
2016
as Kathy DeSantis

Match Game
2016
as Self - Panelist