She also had a recurring role as Claire Mann in the television series Boss in 2012. From 2011 to 2012 she had a recurring role as Aileen Morgan in the TV series Homeland. In 2014 Marin starred as Christine Rosa in the series The Divide and as Pauline Masters in the TV series Masters of Sex. Ireland has also starred in the films I am Legend, Revolutionary Road, Brief Interviews with Hideous Men, Hope Springs, The Letter, and Side Effects. She has also appeared in episodes of the TV series Law & Order: Special Victims Unit, Law & Order, The Good Wife, The Killing, and The Following. Ireland is also a stage actress who won the 2009 Theatre World Award and was nominated for a Tony Award for Best Performance by a Featured Actress in a Play the same year.