Thérèse Ryan studied cello at McGill University with Walter Joachim and then at the Conservatoire de musique de Montréal with Michael Kilburn where she won several awards. She is a member of several ensembles in the Montreal area, including the Orchestre Métropolitain, the Orchestre symphonique de Laval and the Orchestre symphonique de Longueuil.

Alongside her orchestral career, she is occasionally heard as a chamber musician and regularly participated in recordings and projects of various musical genres. This is how she was invited to share the stage with several artists from the Quebec and international scene including Céline Dion. Mrs. Ryan recorded with pianist Francine Chabot two discs on the Atma Classique label entitled "Romance without words" and "Adagio". Thérèse Ryan plays on a Vincenzo Jorio Cello from 1848.