Her father was Albert Isidore Lebas (1853-1930), Brigadier General and military governor of Lille (North), and her mother was Berthe Eugénie Marie Darnaud.
[2] Her second marriage took place in February 1933 in Paris to Raymond Guyot (1877-1934), a professor of modern history at Sciences Po, a lecturer at the Carnegie Institute and editor-in-chief of Politica.
[1][2] Lebas-Guyot began her career as a journalist during the years between world wars, working in France and overseas, with numerous study trips abroad or in the French colonies.
[4] Fluent in English, Lebas-Guyot arrived in the United States in April 1941 and from September 1941 through October 1943, she provided press services and radio broadcasts for the France Forever organization.
In 1943, Yvette Lebas joined the Free French Forces, led by General Charles de Gaulle, as an officer of the women's naval services.