In 1939, Le Moal worked on the 1400 square meter ceiling of the French Pavilion at the International Exhibition in New York.
In 1941, Le Moal exhibited in "XX jeunes peintres de tradition française", with Bazaine, Manessier, Singier, Pignon, Gischia, and in 1943 in "Douze peintres d’aujourd’hui" at Galerie de France. In 1945, he was a founding member of the Salon de Mai.
In the post-war years Jean Le Moal became established as a prominent figure in European painting. He exhibited throughout Europe and was also awarded the "Prix de la Critique" in 1953.
Several retrospectives have been dedicated to Le Moal’s work, including at Musée de Lubeck and Musée de Wuppertal (1961), Musée de Metz and Musée de la Ville de Luxembourg (1963), Musées de Rennes, Chartres, Rouen, Dijon, Lille and Caen (1970–1971), "Espace lyonnais d'art contemporain" and Musées de Besançon, Esch-sur-Alzette, Dunkerque and Nantes (1990–1992).
Le Moal’s work is represented in many museums including
(in French)Le Moal, (Jean Guichard-Meili), Galerie de France, Paris, 1974.
(in French)Jean Le Moal, (Thierry Raspail, Odile Plassard, Jean-Jacques Lerrant, Michel-Georges Bernard), Espace lyonnais d'art contemporain, Lyon, Musée des Beaux-Arts et d'archéologie, Besançon, Galerie-Maison de la culture, Esch-sur-Alzette (Luxembourg), Musée d'art contemporain, Dunkerque and Château des ducs de Bretagne, Nantes, 1990–1992
(in French)Jean Le Moal, (Francis Villadier, Alin Avila, Michel-Georges Bernard), Musée d'art et d'histoire, Meudon, 1997.
(in French) Michel-Georges Bernard, Jean Le Moal, Éditions Ides et Calendes, Neuchâtel, 2001 (208 p.).
(in French)Jean Le Moal, Un chemin de lumière, De chapelles en cathédrales, l'œuvre-vitrail, Musée Pierre-Noël, Saint-Dié-des-Vosges, 2008 (48 p.).