Rossum has starred in movies including Songcatcher (2000), An American Rhapsody, (2001) and Passionada (2002).Her role in Mystic River (2003) garnered her wider recognition.which was an official selection of the 2009 Sundance Film Festival.
An increasing interest in pursuing acting led to taking classes with Flo Salant Greenberg Rossum's television debut was in August 1997, as the original Abigail Williams in the daytime soap opera As the World Turns.
She also had a guest role as Caroline Beels in Snoops.
In her first major studio film, Clint Eastwood's Mystic River, Rossum starred as Katie Markum, the ill-fated daughter of small-business owner Jimmy Markum, played by Sean Penn.
Rossum had a breakthrough role as Laura Chapman in the Roland Emmerich eco-disaster film The Day After Tomorrow.
I want it to have a David Gray or Annie Lennox feel.
I've been spending up to 12 hours a day in the studio." Rossum's album Inside Out was produced by Stuart Brawley. For the promotion of the record, Geffen Records featured the song, "Slow Me Down," as part of the second volume of Hollywood Records' Girl Next compilation album, which was released on July 10, 2007.
Rossum appeared in Warren Leight's "Daily Bread", directed by Lucie Tiberghien.
In mid-2011, Rossum starred in DJ Caruso's social film, Inside.
For anywhere from to a night, Rossum sang in six languages in 20 operas, including La bohème, Turandot, a Carnegie Hall presentation of La damnation de Faust, and A Midsummer Night's Dream.