Debost won major international competitions. He received first prize at the International Competition in Geneva, as well as at the Prague Spring Festival and the Moscow Festival Competition, and he was awarded second prize at the International Competition in Munich. He was Principal Flute in the Orchestre de Paris from its creation in 1967 until 1989. He replaced Jean-Pierre Rampal as Professor of flute at the Conservatoire de Paris. Debost recorded much flute repertoire on LPs and CD. For several decades, he lived in the United States with his wife Kathleen Chastain, who is also a flutist. He taught at the Oberlin Conservatory of Music in Ohio from 1989–2011.
Debost died in Paris on 2 May 2026, at the age of 92.
Notable students of Debost
Emmanuel Pahud – international soloist, principal flute Berliner Philharmoniker