Mary Eileen O'Donnell is an American who was born and raised in the United States of America, and now actively working in the American entertainment industry including television and film, which is why Mary Eileen O'Donnell is very fluent in the English language, especially the American English language. Additionally, it is highly possibility that Mary Eileen O'Donnell can also speak and understand some other languages, including local languages or sign languages spoken in American countries.