[1] He was born in Dijon and studied medicine at the University of Paris and the Pasteur Institute.
Originally, Masson planned a career in clinical medicine, but, after suffering poor health, decided to change his area of interest to biology.
[2] He is credited with first describing neurocrine secretion and his work led to the development of modern neuroendocrinology.
In 1927, he left Strasbourg to become chair of the Pathology department at the Université de Montréal.
[1] He died at the age of 79 and was buried in the Notre Dame des Neiges Cemetery.