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 (born 1939) and a younger sister Bernadette Flamant (born 1947). He was married to Françoise Fouchard (hepatologist) on 16 December 1971 with whom he had three children Juliette Barbarin (lawyer at Total), Cecile Petit-Degos (scenographer), and Vincent Degos (Professor of AnesthesiaResuscitation) and nine grandchildren (Arthur, Maylis, Paul Barbarin, Jules, Zelie, Tom Petit and Oscar, Augustin, Felix Degos). The Degos family is from Mugron (Landes) with several generations of country medical doctors: Jean Baptiste (1797–1859), Alfred (1840–1925) and Louis (1873–1928), his grandfather.