Noël Gloesner started his career shortly after World War II with Fleurus publishers. His first comic, 'Les Mille et Une Aventures de Chiffonnette', appeared in Fripounet et Marisette. In February 1947, he launched the 'Les Indégonflables de Chantovent' series along with Rose Dardennes in that same magazine. He drew the series about fourteen years, and launched a new version in 1975. Also for Fripounet, he produced 'Le Roman de Renard' and 'Les Lionceaux'.
Gloesner cooperated on the 'Yann le Vaillant' series in Coeurs Vaillants from 1948 to 1956. The series was signed Jacques Conoan, a collective pseudonym for Jacques Romont (Jacques), Colette (Co), Noël Gloesner (No) and André (An).
During the same period, Gloesner illustrated numerous comics for Ames Vaillantes and Formule 1 ('Pat Cadwell'), as well as some religious stories for the collection Vivants Témoins. For Triolo, he made a comics adaptation of Victor Hugo's 'Notre-Dame de Paris', and with scriptwriter Monique Amiel, he made 'Sissi' for Djin magazine.
From 1951, Gloesner was present in Pierrot with 'Les Compagnons de Fo-Hi'. This magazine soon merged with Coq Hardi, in which he continued the series. He began a longtime cooperation with Marijac, with whom he worked on the 'Colonel X' series in Coq Hardi, and created several comics for girls' magazines.