She continued working regionally throughout New Jersey and continued her education at Trinity College in Hartford, Connecticut.

At Trinity, she majored in English and painting and continued her stage work in many more musicals. She earned a degree in Comparative Arts from Trinity before moving to New York to study acting at the William Esper Studio

She has worked in many New York theaters, some of which include The Atlantic Theatre Company, Alice's 4th Floor, and Naked Angels, where she appeared in Jon Robin Baitz's A Fair Country.

Her additional state credits includes the David Warren-directed production of My Marriage to Ernest Borgnine.

Her first film role was in the 1994 remake Miracle on 34th Street. In 1999 she made her Broadway debut as Sally Bowles in Cabaret.

Having just finished her successful run opposite Alan Cumming, Mary has been seen starring in a succession of films. She has been working steadily on the heels of her critically acclaimed role opposite Howard Stern in Private Parts.

Mary McCormack appeared in a leading role in Steven Soderbergh's 2002 film, "Full Frontal", opposite Julia Roberts, David Duchovny and Catherine Keener. In her latest film, she can be seen starring opposite David Spade in the comedy "Dickie Roberts: Former Child Star."

McCormack recently completed production on "Traffic", a mini-series based on the BBC mini-series and Academy Award-winning feature film of the same name for the USA Network, directed by Stephen Hopkins ("24"). USA will debut the mini-series in January 2004. She will also appear in "Madison", opposite Jim Caviezel and Bruce Dern, which is scheduled to be released in 2004.

Her performance opposite Howard Stern in 1997's "Private Parts" won her critical acclaim and was followed by a highly successful run starring as Sally Bowles in the Roundabout Theater Company's Broadway revival of "Cabaret" at Studio 54, opposite Alan Cumming and directed by Sam Mendes & Rob Marshall.

For Universal Films she starred in "K-Pax" with Jeff Bridges and Kevin Spacey. Her other leading roles include "High Heels & Low Lifes" opposite Minnie Driver, and "Mystery, Alaska," which was written by David E. Kelley and starred Russell Crowe.

McCormack appeared in the independent films "Other Voices", starring opposite Stockard Channing and Campbell Scott, and in "The Broken Hearts Club," both of which premiered at the 2000 Sundance Film Festival. She also starred in the short film "Big Love", opposite Sam Rockwell, which premiered at the 2001 Sundance Film Festival.

McCormack portrayed the "President of the World Hair Federation" alongside Frances Fisher and Craig Ferguson in "The Big Tease." She also appeared with Sandra Bullock and Liam Neeson, playing a mobster's wife in a scene-stealing role in Disney's "Gun Shy", and in the 1999 Sundance Film festival premiere "Getting to Know You."

Her other credits include "True Crime", directed by Clint Eastwood; "Deep Impact"; "The Alarmist", opposite Stanley Tucci and David Arquette; "Father's Day," Colin Fitz", "Miracle on 34th Street", and "Backfire."

McCormack also received widespread praise for her series regular role as Justine Appelton, on the Steven Bocho television series, "Murder One."