Laurent Degos, Professor of Haematology at the University of Paris, was born on July 9, 1945 in Paris (75008) from Robert Degos (1904-1987) medical doctor, Professor of Dermatology and Monique Lortat Jacob (1916-1999), third of four children, an older brother Jean Denis (1937-2001) Professor of Neurology, Claude François Professor of Neurology (1939-) and a younger sister Bernadette Flamant (1947-).