French physician, born in Quimper, Brittany, and died in Kerlouanec, Finistère. He studied medicine in Nantes and received his doctorate at École de médicine de Paris. He served in a military at Nantes hospital and the hospital Necker, where he taught pathology. Shortly afterwards he was Professor at the Collège de France and Professor of internal medicine at the Charité. He was the founder of medicine clinicopathological, comparing the symptoms of the disease with lesions that this causes in the organism. Highlighted by an important discovery: performed a differential diagnostics of cardiac and pulmonary diseases through the stethoscope which he developed for auscultation. He is the author, among other works, Treaty of mediate auscultation and diseases of the lungs and the heart (1819), translated into many languages, and propositions about the medical dosctrina of relative to practical medicine Hippocrates.