She is most known for being the voice of Poison Ivy in the Arkham series from 2009 to 2015 as well as in a number of other video games, such as Sniper Wolf in Metal Gear Solid and her various roles in the Star Wars Universe.

[citation needed] Her twin brother is a former television writer and now solar marketing consultant Tor Alexander Valenza.

[2][3] In the early part of her career, Valenza played the role of Dottie Thornton on All My Children from 1982 to 1986, earning a Daytime Emmy nomination for her work.

She also showed up in a guest star appearance in the fifth season of The A-Team, and a recurring role as Lieutenant Winslow in Space: Above and Beyond.

In January 2023, Valenza guest voiced a character, Tawni Ames, the Separatist governor of Desix, who opposes the Empire's occupation, on Star Wars: The Bad Batch.