He was the son of Eugène Victor Masson, a 33-years old man who worked as a sales representative, and Céline Alice Haché, who was age 24.
[1] For a short while Maurice Masson worked as an architect in 8th arrondissement of Paris before moving to Saigon in Indochina in 1936 where he lived for the rest of his life.
[3] He was called to continue the project of the Cathedral of Phnom Penh after Louis Chauchon had died in the bombings of Saigon in 1945.
[1] The work of the Cathedral was completed a few months afterwards by another architect, Henri Chatel,[4] whom he had hired back in 1949.
He also received the Croix de guerre and various military medals for his courage in battle during the First World War.