Detroit native Elisabeth Harnois relocated to California at a young age and was raised in Los Angeles. Living in such close proximity to the home of the film industry, she began appearing in film and TV at the age of six, with a role in the movie One Magic Christmas. She would go on to study at Wesleyan University, and graduated in 2001 with a degree in film studies. Getting back into the business after graduation, Harnois began appearing in films like the critically acclaimed Pretty Persuasion in 2005, Chaos Theory in 2007, and A Single Man in 2009. Branching into lighthearted fare in 2011, the actress would sign on to provide the voice of Ki in the animated film Mars Needs Moms. Later that same year, Harnois joined the cast of CSI: Crime Scene Investigation as Morgan Brody.