Mary McCormack
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).
Acting
Movie
1408
as Lilly Enslin
2007
Movie
Deep Impact
as Andrea Baker
1998
Movie
K-PAX
as Rachel Powell
2001
Movie
Miracle on 34th Street
as Myrna Foy
1994
TV
ER
as Debbie
1994
Movie
True Crime
as Michelle Ziegler
1999
TV
The Pitt
as Dr. Linda Conley
2025
TV
The Newsroom
as Molly Levy
2012
TV
Law & Order
as Rickie the Bartender
1990
TV
Scandal
as Lisa Elliot
2012
TV
The West Wing
as Kate Harper
1999
Movie
54
as New Year's Eve Wife (uncredited)
1998
Movie
Private Parts
as Alison Stern
1997
TV
Law & Order: Criminal Intent
as Mary Shannon
2001
Movie
Scooby-Doo! WrestleMania Mystery
as Ms. Richards (voice)
2014
Movie
Unpregnant
as Debra Clarke
2020
Movie
Fathers' Day
as Virginia Farrell (uncredited)
1997
Movie
Drone
as Ellen
2017
Movie
Mystery, Alaska
as Donna Biebe
1999
Movie
Right at Your Door
as Lexi
2006
Movie
Vicious
as Mother
2025
TV
House of Lies
as Denna Altshuler
2012
Movie
Dickie Roberts: Former Child Star
as Grace Finney
2003
TV
Jimmy Kimmel Live!
as Self
2003