Marie-France Lefebvre works regularly as a guest assistant conductor at opera companies, including The Metropolitan Opera and San Francisco Opera. She was a member of the full time Music Staff of the Washington National Opera from 1994-2004.  She has worked with Houston Grand Opera, Wolf Trap Opera, Santa Fe Opera and Seattle Opera.  She was the program and music director for the 20th Century Opera and Song Interpretation Program at the Banff Centre for the Arts.

Marie-France worked as a prompter at Washington National Opera, The Metropolitan Opera and at San Francisco Opera, with singers including José Carreras, Plácido Domingo, Lawrence Brownlee, Samuel Ramey, Ferruccio Furlanetto, Diana Damrau, Matthew Polenzani, Mariusz Kwiecien, Renée Fleming, Dame Kiri Te Kanawa and Verónica Villaroel. She has assisted conductors Roberto Abbado, Jiří Bělohlávek, Heinz Fricke, James Levine, Nicola Luisotti, Gianandrea Noseda, Sir Simon Rattle, Emmanuel Villaume.

Marie-France currently serves as official accompanist for the Metropolitan Opera National Council Auditions in Washington, DC. She has been heard on many CBC Radio recitals, and has performed with artists including Samuel Ramey, Dmitri Hvorostovsky, Bruce Ford, Denyce Graves, Susanne Mentzer, and Harolyn Blackwell.

Marie-France studied piano with Monique Collet-Samyn, Marek Jablonski, Dale Bartlett, Donal Nold, Artur Balsam, Joseph Seiger, Martin Katz, Arthur Greene, Anton Nel, Laura Kargul, and Soeur Claire Dubois. She holds a DMA in Piano Accompanying from the University of Michigan and an MM in Accompanying from the Manhattan School of Music.

Prior to joining CCM in 2008, Marie-France served on the faculty of the Michigan State University School of Music (2004-2008) and, previously was a guest instructor at the University of Maryland.  She worked as a guest French diction coach at The Curtis Institute of Music from 1999-2004.