He began his career in the diplomacy and he served with the economic cooperation group of the Minister of Foreign Affairs (1969–1972).
After a short passage to the cabinet of the Prime Minister in the capacity as operations manager in 1972, de Noailles entered the Office de Radiodiffusion Télévision Française (ORTF) as a principal private secretary of the general president-directors Arthur Tells then Marceau Long, then of the president of FR 3, Claude Contamine.
The 1981 general election returned him to the Quay d'Orsay, where de Noailles became the second adviser of the French Embassy to the United States (1982–1986).
On 11 March 1972, de Noailles married Cécile Nadèje Marie Paule Gonin (born 25 November 1945, Boulogne-Billancourt) at Épinay-Champlâtreux.
Together they have three children, two daughters and one son: As heir apparent of the Dukedom of Noailles he was styled with the title Duke of Ayen between 1953 till 2009.