 From 1956, he studied at the Paris Conservatoire with Rolande Falcinelli, graduating in 1958 with a first prize in organ playing and improvisation.Thiry was titular organist of the 1732 Lefebvre organ at the chapel of the Charles Nicole Hospital, part of the University Hospital in Rouen.He was professor of organ in Metz where one of his students was Bernard-Marie Koltès, and held the same position at the where his students included Alain Mabit, Céline Frisch and Benjamin Alard.