She is best known for her roles as Tawny Dean on Even Stevens,[2] Alex Jensen on The Big Bang Theory,[3] and Delilah Fielding-McGee on NCIS.

[1] In 2000, she was cast in the Disney Channel sitcom Even Stevens as Tawny Dean, the female best friend of series lead Louis.

Beginning in 2012, she appeared in The Big Bang Theory as Alex Jensen, the assistant of Sheldon Cooper,[3] and the following year debuted in the long-running series NCIS as Delilah Fielding,[4] the wheelchair user wife of Timothy McGee who works as an intelligence analyst at the US Department of Defense.

Harshman starred on the short-lived TV shows Run of the House and Center of the Universe.

[9] In 2009, Harshman won the ShoWest "Female Stars of Tomorrow" award at the ShoWest Convention along with fellow Sorority Row cast members Briana Evigan, Leah Pipes, Rumer Willis, Jamie Chung and Audrina Patridge.