At the "Centre d' Art", he worked under the supervision of Rigaud Benoit who thought him the elementary principals of pictorial art . Dewit Peters, founder of Centre d'Art, made him chief of the studio. In 1949, Cedor is chosen as a member of the committee of administration of the "Centre".
Merged in a conflict that opposed the artists and the management of the "Centre", he was elected president of the Haitian Artist Association. Later on became a member/founder of the "Foyer des Arts Plastiques" (F.D.A.P). From 1952 to 1956, he was the director of the F.D.A .P.
Cedor participated with Luckner Lazard and Roland Dorcely, at the foundation of the "Galerie Brochette" in 1956, where he stayed until 1962.. . In 1957, he was named director of the museum of Beaux-Arts of Port-Au-Prince.
Dieudonne Cedor is considered one of the leading contemporary painters. His name can be found in all the major art books namely “ Peintres Haitiens” where the author Gerald Alexis refers to him as “ Cedor can handle any subject expressing joy or sorrow, the splendors and anxieties of life.”