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).
TV credits
Rated 8.7 out of 10
The Pitt
2025
Rated 7.4 out of 10
Heels
2021
Rated 7.6 out of 10
The L Word: Generation Q
2019
Rated 6.8 out of 10
The Kids Are Alright
2018
Rated 5.2 out of 10
25 Words or Less
2018
Rated 7.2 out of 10
For the People
2018
Rated 7.5 out of 10
Will & Grace
2017
Rated 6.4 out of 10
Loaded
2017
Rated 6.5 out of 10
Divorce
2016
Rated 6.4 out of 10
Match Game
2016
Rated 5.8 out of 10
To Tell the Truth
2016
Rated 5.1 out of 10
Chelsea
2016
Rated 5.4 out of 10
Chelsea Does
2016
Rated 6.4 out of 10
Angie Tribeca
2016
Rated 5.3 out of 10
Welcome to the Family
2013
Rated 8.1 out of 10
The Newsroom
2012
Rated 7.2 out of 10
Scandal
2012
Rated 6.6 out of 10
House of Lies
2012
Rated 5.0 out of 10
Watch What Happens Live with Andy Cohen
2009
Rated 5.9 out of 10
Late Night with Jimmy Fallon
2009
Rated 7.0 out of 10
In Plain Sight
2008
Rated 6.8 out of 10
The Late Late Show with Craig Ferguson
2005
Rated 6.5 out of 10
Traffic
2004
Rated 4.9 out of 10
K Street
2003