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

Acting Born February 8, 1969 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).

Known For

Watch What Happens Live with Andy Cohen

Self - Guest

Law & Order

Rickie the Bartender

The Late Late Show with Craig Ferguson

Self

Jimmy Kimmel Live!

Self

Law & Order: Criminal Intent

Mary Shannon

The West Wing

Kate Harper

The Pitt

Dr. Linda Conley

ER

Debbie

The Tonight Show with Jay Leno

Scandal

Lisa Elliot

The Ellen DeGeneres Show

Self

Tony Awards

Self - Nominee