Mary McCormack stars as Mary Shannon in the fourth season of the hit USA Network original series "In Plain Sight."

One of today’s boldest and most versatile actresses, McCormack continues to challenge herself with roles that often defy Hollywood standards and bring to light the complex lives of ordinary women. She has shown her immense talent working in film, television, and on stage, and has tackled roles ranging from slapstick comedy to intense drama.

McCormack’s breakout performance, opposite Howard Stern in "Private Parts," won her universal critical acclaim. She followed that film with a highly successful run opposite Alan Cumming as Sally Bowles in the Sam Mendes and Rob Marshall-directed Broadway production of "Cabaret" for the Roundabout Theatre Company.

She returned to the Broadway stage last year in "Boeing-Boeing," starring alongside Christine Baranski, Mark Rylance and Bradley Whitford. Marc Camoletti’s classic sixties comedy earned McCormack a 2008 Tony nomination for "Best Performance by a Featured Actress in a Play."

McCormack was recently seen in "Right at Your Door," playing the role of a wife separated from her husband after an attack on Los Angeles contaminates the entire city. In addition, she appeared as a series regular on NBC’s award-winning program "The West Wing" and as a recurring character on the critically acclaimed NBC series, "ER."

Some of McCormack’s additional television and feature credits include the Stephen King thriller "1408," costarring John Cusack and Samuel L. Jackson; Christopher Guests’ "For Your Consideration;" the Steven Soderbergh and George Clooney HBO political series, "K Street;" as Justine Appleton in Steve Bochco’s "Murder One;" and in the USA Emmy-nominated miniseries, "Traffic," directed by Stephen Hopkins ("24"). In addition, McCormack has appeared in varied roles in such films as "Dickie Roberts: Former Child Star," opposite David Spade; "K-PAX," opposite Jeff Bridges and Kevin Spacey; "High Heels & Low Lifes," with Minnie Driver; "Mystery, Alaska," written by David E. Kelley and starring Russell Crowe; "Other Voices," with Stockard Channing and Campbell Scott; "The Broken Hearts Club," opposite John Mahoney and Timothy Olyphant; "The Big Tease," opposite Craig Ferguson; "Gun Shy," with Sandra Bullock and Liam Neeson; the Clint Eastwood film "True Crime;" Mimi Leder’s "Deep Impact;" "The Alarmist," opposite Stanley Tucci; "Father’s Day," with Robin Williams and Billy Crystal; and "Miracle on 34th Street."

Additional stage credits include the acclaimed London stage production of Neil LaBute’s play "Bash" and the David Warren-directed productions of "My Marriage to Ernest Borgnine" and "A Fair Country."

Born in Plainfield, N.J., McCormack is a graduate of Trinity College and resides with her family in Los Angeles.