With his wife Brigitte Massin, he is the author of numerous books of history and musicology.
After studying at the seminary in Rome, Massin remained a Catholic priest until 1952, despite questions about tradition.
He was close to Paul Claudel, the theologians Yves Congar and Pierre-André Liégé [fr], vicar of the Parish of Saint Séverin.
[2] In collaboration with his wife Brigitte Massin née Toulemonde (1927-2002), he published in the 1950s two reference works of musicology, Ludwig van Beethoven and Wolfgang Amadeus Mozart.
[4] Director of the series Portraits de l'Histoire [fr] at the "Club français du livre [fr]", Jean Massin wrote various historical works among which "Robespierre", "Marat"[3] and "Don Juan: mythe littéraire et musical".