The surgical work of Pierre Marion extends over a period of 40 years. It takes part in the history of portal hypertension surgery. Pierre Marion has been in France one of the major craftsmen of heart surgery with Paul Santy. In 1952, he performed the first pulmonary-embolectomy with success and later devoted his time to the development of valves and of an artificial heart. The second part of his life was dedicated to the direction of the Bullukian Foundation, founded in 1983, with the goal of helping medical research, supporting the armenian community in our country and promoting literary, artistic and theatrical creation in Lyons and its surroundings. Pierre Marion has written two remarquable books "Afin que batte le coeur", a history of the cardiac surgery epic and "Le génial bonhomme Ampère", consecrated to the life of this great scholar.