Cressida guest-starred in several television shows and theatre productions, such as Loco Motives[1] and made her feature film debut in The Long Way Home,[2] before starting her voice acting career in 2000.

She can also be heard in other attractions throughout the Disney Parks, including The Twilight Zone Tower of Terror, Toy Story Midway Mania!, and Epcot Character Spot.

She was the first voice actress to narrate for WatchMojo.com and has also made appearances in video games, including Marvel Heroes,[6] Guild Wars 2, Fallout 4, Mirror's Edge, Master of Orion, The Elder Scrolls, Star Trek Online, EverQuest, Titan Quest, Dragon Age, and World of Warcraft, among others.

She is represented by Cool Water Productions and Talent for Cons, a booking agent for fan conventions such as San Diego Comic-Con.

She shared her story about being diagnosed with Dermatofibrosarcoma protuberans in 2012 and the subsequent two years of life-threatening surgeries and specialized treatment she went through in order to re-learn how to speak so she could continue her career.