Rosemarie DeWitt was born in Flushing on October 26, 1971, Queens, New York, the daughter of Rosemarie (Braddock) and Kenny DeWitt. She is a granddaughter of boxer James J. Braddock, and played the role of neighbor Sara Wilson in the movie Cinderella Man, which depicted James J. Braddock’s life.
Rosemarie DeWitt lived in Hanover Township, New Jersey and is a graduate of Whippany Park High School. She performed in several high school productions. She attended the New College at Hofstra University where she received a Bachelor of Arts in creative studies. While at Hofstra University, she also joined Alpha Phi. She had additional training at The Actors Center in New York.
Rosemarie DeWitt performed in numerous off Broadway plays. Most notably, she starred in John Patrick Shanley’s Danny and the Deep Blue Sea at the Second Stage Theatre; George S. Kaufman’s The Butter and Egg Man at the Atlantic Theater Company; and Craig Lucas’ Small Tragedy, for which the entire cast won an Obie Award. From May 4–23, 2010, DeWitt appeared in MCC Theater’s Off Broadway play Family Week.
DeWitt appeared in Showtime’s series United States of Tara as Tara’s sister, Charmaine. She appeared in Season 1 of the AMC series, Mad Men. She co-starred with Ron Livingston in the 2006–2007 Fox series Standoff. She played FBI hostage negotiator Emily Lehman. DeWitt has also appeared on television in Law & Order: Special Victims Unit, Sex and the City, Rescue Me, and Love Monkey.
DeWitt is featured in the film, Margaret opposite. Additional film credits include Purple Violets, Off the Black, Shut Up and Sing, The Great New Wonderful, Blackbird and How I Got Lost. She plays the role of Rachel in the movie Rachel Getting Married (2008), for which she won several critics’ awards and a Satellite Award for Best Supporting Actress.
Rosemarie DeWitt played Ben Affleck’s character’s wife in the corporate drama The Company Men. In 2011 she played Hannah, one of the three lead characters in the critically acclaimed Your Sister’s Sister. In 2011, she played Renee Blair in the film A Little Bit of Heaven starring Kate Hudson.
In 2012, she played Alice in Gus Van Sant’s film Promised Land, released on December 28, 2012.
She married actor Ron Livingston, her co-star in Standoff, on November 2, 2009, in San Francisco. In May 2013, they announced that they had adopted a daughter. Gracie James Livingston was born on April 29, 2013.
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