Themmen was born on April 7, 1935, in
New York City, where she began studying piano at age 7. She attended the
New England Conservatory of Music, where she met and married Harold B. Themmen. They had three children,
Paris, Allegra, and Tania. Tania is married to voice actress
Susan Blu. In addition to the New England Conservatory, Themmen studied in Europe, at the
Eastman School of Music, and at the
Tanglewood Music Center. Her teachers included
Francis Judd Cooke,
Nicolas Flagello,
Lukas Foss,
Carl McKinley, Jean Rosenblum, and Otto Schulhof. Themmen taught at the Hampton Conservatory and also worked as an accompanist for the
American Ballet Theatre. She received grants from the
New Jersey State Council on the Arts, Queens Symphony, and the
New York State Council on the Arts. Her music was published by Lyra Music Company. ==Discography==