Manessy was born on 28 March 1923. After studying literature, his interest shifted to ethnology.
After working briefly at the CNRS, he taught linguistics at the Faculty of Letters of Dakar and became the first Director of the Centre de linguistique appliquée de Dakar (CLAD). He was appointed Professor in 1964. He supervised Masters students in African Linguistics, first at Dakar, then at the Faculty of Letters and Human Sciences at Aix-en-Provence. From 1969 to 1988, he taught at the Faculty of Letters and Human Sciences at the University of Nice. He retired in 1988.[5]
^Manessy, Gabriel. 1979. Contribution à la Classification Généalogique des Langues Voltaïques. (Langues et Civilisations à Tradition Orale, 37.) Paris: Centre National de la Recherche Scientifique.
^Manessy, Gabriel. 1969. Les Langues Gurunsi: Essai d'application de la méthode comparative à un groupe de langues Voltaïques. (Bibliothèque de la SELAF, 12, 13.) Paris: SELAF.
^Manessy, Gabriel (1975). Les langues Oti-Volta. Paris: SELAF.
^Manessy, Gabriel (1979). Contribution à la classification généalogique des langues voltaïques : - le proto-central (Langues et civilisations à tradition orale №37 ed.). SELAF: PARIS.
^ abcNicolaï, Robert (2001). "Hommage à Gabriel Manessy. Leçons d’Afrique : Filiations, ruptures et reconstitutions des langues, 7-9. Peeters.