She is known for playing Zoe Graystone in the science fiction television series Caprica and Claire in The Big Bang Theory.

"[4] Torresani's television debut was at age nine when she hosted the "Kids' WB Club" for San Francisco's KBWB (Channel 20).

Her other television credits include guest appearances on Even Stevens, JAG, ER, The War at Home, Malcolm In The Middle, Arrested Development, Terminator: The Sarah Connor Chronicles, and CSI: Crime Scene Investigation among others.

In May 2008, Torresani was cast as Zoe Graystone in Syfy's Caprica,[5] a prequel spin-off of Battlestar Galactica, which debuted in 2009.

In 2009, Rolling Stone announced that she was cast to play Lita Ford in The Runaways, a biopic about the all-girl punk band of the same name.