Marie-France Lefebvre works regularly as a guest assistant conductor at major opera companies, including The Metropolitan Opera, where she returns regularly since 2007. She was a member of the full time Music Staff of the Washington National Opera from 1994-2004. She has also worked with Wolf Trap Opera, Santa Fe Opera, Houston Grand Opera, Cincinnati Opera, Des Moines Metro Opera, Minnesota Opera, Calgary 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. She has also served as a faculty member of the Collaborative Piano Institute (CPI)  in Minnesota.

Marie-France has worked as a prompter at Washington National Opera, The Metropolitan Opera and at San Francisco Opera, working with singers including José Carreras, Plácido Domingo, Lawrence Brownlee, Samuel Ramey, Ferruccio Furlanetto, Renée Fleming, Dame Kiri Te Kanawa, Diana Damrau, Isabel Leonard, Erin Morley, Vittorio Grigolo, Matthew Polenzani, Jamie Barton, Mariusz Kwiecien, and Verónica Villaroel. She has assisted, among others, Marco Armiliato, Louis Langrée, Nicola Luisotti, Sir Simon Rattle, Emmanuel Villaume, Yannick Nézet-Séguin, Gianandrea Noseda, Carlo Rizzi, Robert Spano, James Levine, Roberto Abbado, Heinz Fricke, Alain Trudel.

Marie-France served as official accompanist for the Metropolitan Opera National Council Auditions in Washington, DC (until 2019- the auditions not currently held there now). She has been heard on many CBC Radio recitals, and has performed with artists including Matthew Polenzani,  Samuel Ramey, Dmitri Hvorostovsky, Bruce Ford, Denyce Graves, 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, 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, where she is a Professor of Opera, Marie-France served on the faculty of the Michigan State University School of Music from 2004-2008, and previously was a guest instructor at the University of Maryland.  She worked as a guest French diction coach with The Curtis Institute of Music from 1999-2004.