Acting · Filmography
Mary McCormack
Born February 8, 1969 (age 57)Plainfield, New Jersey, USA
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).
Filmography
Where to watch Mary McCormack’s work in 
United States
Top 30 by popularity. Click any title to see exactly which OTT carries it in United States.
4.9
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Watch What Happens Live with Andy Cohen
2009
7.3
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Law & Order
1990
7.6
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Law & Order: Criminal Intent
2001
8.3
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The West Wing
1999
8.7
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The Pitt
2025
7.2
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Scandal
2012
5.3
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Jimmy Kimmel Live!
2003
6.8
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The Late Late Show with Craig Ferguson
2005
7.8
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ER
1994
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Tony Awards
1956
5.2
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25 Words or Less
2018
5.6
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The Ellen DeGeneres Show
2003
7.0
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In Plain Sight
2008
5.1
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Chelsea
2016
8.1
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The Newsroom
2012
7.5
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Will & Grace
2017
6.6
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House of Lies
2012
6.4
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Match Game
2016
5.8
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To Tell the Truth
2016
5.9
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Late Night with Jimmy Fallon
2009
6.4
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Angie Tribeca
2016
7.7
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Murder One
1995
6.2
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Deep Impact
1998
7.6
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The L Word: Generation Q
2019
6.5
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Divorce
2016
5.3
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The Late Late Show with Craig Kilborn
1999
6.7
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1408
2007
7.2
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For the People
2018
7.4
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Heels
2021
6.8
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Miracle on 34th Street
1994