Mary McCormack

About

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).

Known for

Law & OrderSeries • 1990Law & Order: Criminal IntentSeries • 2001The West WingSeries • 1999The PittSeries • 2025ERSeries • 1994ScandalSeries • 201225 Words or LessSeries • 2018Will & GraceSeries • 2017In Plain SightSeries • 2008Angie TribecaSeries • 2016The NewsroomSeries • 2012House of LiesSeries • 2012Murder OneSeries • 1995DivorceSeries • 2016For the PeopleSeries • 2018The L Word: Generation QSeries • 2019Deep ImpactMovie • 1998HeelsSeries • 2021ViciousMovie • 20251408Movie • 2007Miracle on 34th StreetMovie • 1994K-PAXMovie • 2001Mystery, AlaskaMovie • 1999The Kids Are AlrightSeries • 2018