Mary McCormack began her acting career at age 12 performing
in Gian Carlo Menotti's Christmas opera, Amahl and the Night
Visitors. She continued her stage work in many more musicals,
and finished an acting program at the William Espor Studio. She
has worked in many New York theater productions, including The
Atlantic Theater Company, Alice's 4th Floor and Naked Angels,
where she appeared in Jon Robin Baitz's A Fair Country.
Mary McCormack's key television roles include Justine Appleton on Murder One (1995 - 1997); and Kate Harper on The West Wing (2004 - 2006). She also starred in the HBO series K Street, which only aired for ten episodes.
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