She is originally from the San Francisco Bay Area, but has been living in Paris, France since the early 1990s. Mann has dubbed into English for French actresses Marion Cotillard (The Last Flight) and Diane Kruger (Forces spéciales) as well as comedic actresses Isabelle Nanty in Amelie, and Michèle LaRoche in The Closet. She also dubbed into French, Absolutely Fabulous' Jennifer Saunders in Entente Cordiale.
As a voice actress, Mann is best known for voicing Jeremy Belpois and Aelita Schaeffer in the cartoon series Code Lyoko. Her other voice work includes several video games such as Dark Earth (1997), Syberia (2002), Egyptian Prophecy: Fate of Ramses (2004), Indigo Prophecy (2005), and the PC game Runaway 3: A Twist of Fate.
Mann appeared at Live Oak Theatre playing Cherry in the original production of Roan Brown and Cherry written and directed by Pulitzer-prize winner Charles Gordone. She also appeared on the Hartford Stage in the Ensemble of Mark Lamos' award-winning production of Peer Gynt starring Richard Thomas.