Marguerite Allar was the daughter of Fernand Allar, architect-entrepreneur and the granddaughter of Gaudensi Allar architect, brother of the sculptor André-Joseph Allar . Her mother Angeline Allar née Galli (1874-1963) was herself a painter. She devoted herself to painting and became a pupil of the renowned Jean Patricot . She painted Provencal and oriental landscapes, as well as portraits (Countess Pastré etc.). From 1928, she exhibited regularly at the salon of French artists in Paris and at regional exhibitions. She also created stained glass windows (Saint-Lucien aux Goudes chapel in Marseille).
In 1946, she created her own academy on the Old Port at 13 Quai de Rive Neuve where she was the neighbour of the painter François Diana . She taught drawing, painting, art history and decoration there. This academy will be known for many years and contributed to the training of many young artists.