After high school, she attended the University of Delaware and majored in elementary education,[1] and in the fall of 1998 was in the a cappella group the Deltones.

[5] In 1999, an 18-year-old Tohn came back to Los Angeles with her agent and mother and moved in with actress Jessica Biel and her family in Calabasas, after meeting at the TV Guide Awards, to pursue her career.

She has appeared in the films Dawg in 2002 (also known as Bad Boy) alongside Denis Leary, Deuces Wild as Mary Ann, and Return to Sleepaway Camp as Linda.

[3] She has appeared in the television series The Sopranos, Strangers with Candy, Angel, Rules of Engagement, Veronica Mars and It's Always Sunny in Philadelphia.

In 2007, she appeared in the short films Smile, Discovering The Wheels, The Malibu Myth, The Legend of Donkey-Tail Willie and Catch (where she was shown playing the guitar) which were made during the reality show On the Lot.

[citation needed] She performed "A Little Less Conversation" from Elvis Presley during Top 36 (Group 1) under the theme Billboard Hot 100 Hits to Date and was eliminated without advancing to the finals.

[citation needed] In 2011, she appeared on the songwriting-competition reality show Platinum Hit on the American cable network Bravo as one of 12 aspiring songwriters.

[13] In 2019, Tohn appeared in Epic Rap Battles of History portraying Joan Rivers in the episode "George Carlin vs Richard Pryor".