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Mary was an intern and a cocktail waitress while pursuing her acting career.
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Mary graduated from Wardlawy-Hartidge School in 1987.
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Mary's parents divorced in 1990.
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Mary worked with the following stage companies:
-The Atlantic Theatre Company
-Alice's 4th Floor
-Naked Angles
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Mary appeared with her brother William McCormack in the 1997 independent film Colin Fritz.
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Mary and her husband have two children, one born in 2004, and the other in 2007.
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Mary replaced actress Kate Walsh in the film 1408 after Walsh had to drop out of the project.
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Mary is 5' 8" (1.73 m).
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Mary is of Irish descent.
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As of 2007, all of the movies Mary has appeared in have grossed a total of $333,144,910.
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Mary studied acting at the William Esper Studio.
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Mary was nominated twice for Best Ensemble Cast at the Screen Actors Guild for her work on The West Wing in 2005 and 2006.
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Mary made her feature film debut in the 1994 remake of A Miracle on 34th Street.
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Mary is the sister of actor Will McCormack.
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She was married in the summer of 2003.
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Mary attended Trinity College, majoring in English.
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Mary began her acting career at age 12 performing in Gian Carlo Menotti's Christmas opera, Amahl and the Night Visitors.