Pierre Masson's influence on teaching of pathology in Canada has been unique. One of the most eminent pathologist, director of the Institute of anatomopathology of Strasbourg, he accepts, in 1926, to be the ambassador of the french science in North America. He is named professor and Chairman of the Department of pathology of the University of Montreal. Very soon, his "school" is world renowned and contributes to the excellent reputation of his new country of adoption. During his career, Pierre Masson has published more than 131 original scientific papers and written his masterpiece "Les tumeurs humaines" which has been translated in English. Masson died in 1959, but his influence is prolonged be his collaborators and students who still cherish his memory.