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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.
7.3
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Law & Order
1990
5.0
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Watch What Happens Live with Andy Cohen
2009
8.7
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The Pitt
2025
7.6
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Law & Order: Criminal Intent
2001
8.3
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The West Wing
1999
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ER
1994
6.8
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The Late Late Show with Craig Ferguson
2005
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Scandal
2012
5.3
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Jimmy Kimmel Live!
2003
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Tony Awards
1956
5.5
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The Ellen DeGeneres Show
2003
6.4
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Angie Tribeca
2016
5.1
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Chelsea
2016
7.1
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In Plain Sight
2008
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The Newsroom
2012
5.2
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25 Words or Less
2018
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Late Night with Jimmy Fallon
2009
6.4
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Match Game
2016
7.5
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Will & Grace
2017
7.7
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Murder One
1995
5.7
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To Tell the Truth
2016
6.6
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House of Lies
2012
7.6
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The L Word: Generation Q
2019
6.5
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Divorce
2016
7.3
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For the People
2018
5.2
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The Late Late Show with Craig Kilborn
1999
6.7
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1408
2007
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Heels
2021
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Deep Impact
1998
6.5
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Traffic
2004