Tracy Grandstaff is the voice of Daria.
She was the voice of Daria in "Beavis and Butthead", as well as the voice of Cassandra, Lolitta, Tanqueray, Heather and Jennifer.
Tracy also writes some on-air promotions for MTV. She writes copy for the MTV VJs, and is also a writer for MTV's "The Tom Green Show".
Here's an interview with Tracy