Mary Kay Bergman
Mary Kay Bergman , credited on the first three seasons of South Park as Shannen Cassidy, was an American voice actress and voiceover teacher. Born in Los Angeles, California, US, she had an interest in fantasy and animation early in her life. She acted in plays in high school and also studied theater at University of California, Los Angeles. After unsuccessful acting jobs, she was considering a career in the Air Force, when going wild on karaoke at a housewarming party changed her life. In 1989, she began voicing the Disney character Snow White. Bergman is widely known for her voice work in the earliest seasons of South Park and The Fairly OddParents. She did voice work for over 400 television commercials.
Mary Kay Bergman was born on June 5, 1961, in Los Angeles, California. She was the only child of musicians David Dave Bergman and Patricia Paris Pat McGowan. She grew up around the corner from the home of Adriana Caselotti, the original voice of Snow White.
Source: Wikipedia