Born in Dakar, he was the eldest son of Henry Loiseleur des Longchamps Deville (1887, Paris – 1956, Sarlat), chief administrator of France d'outre-mer, and Marie Gramain (1889–1966).
In parallel to his career as an 'attaché de direction' at the Banque Française du Commerce Extérieur from 1948 to 1953 then at the société H. Ernaut-Somua, he wrote his first monographs on the towns of La Celle Saint-Cloud then on those of Payrac.
Keen on the history of the Languedoc, south-west France and the Ile-de-France and influenced by several historical figures, he produced a large number of monographs and biographies and also frequently organised conferences.
[2] For several years he attended international French-speaking colloquia in the canton of Payrac organised by the Association des écrivains de langue française and its president Edmond Jouve.
[3] They were both members of the Association de Sauvegarde des Maisons et Paysages du Quercy and in that role were consulted on expanding the "La Bouriane" guide.