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).
Mary McCormack has 60 screen credits in a career dating back to 1990. Their work is anchored in the An American Girl Collection universe with 1 titles. Signature works include In Plain Sight, 1408, Vicious. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.
