Annette Benacerraf, Zadoc-Kahn's grand-niece, related to her husband (Nobel laureate, Baruj Benacerraf) how one of his last known addresses in France was in Le Ruel, Haravilliers in Seine-et-Oise, north-west of Paris (now part of the Val d'Oise département) and from here a letter was sent by Zadoc-Kahn to Désirée Damengout, a nursing colleague at the Rothschild Hospital, containing the following: