During the Fall of France in 1940, Galley was able to escape to the United Kingdom disguised as a Polish soldier.
[2] He joined the Free French Forces and was sent to North Africa, including the Battle of El Alamein.
Galley was next stationed within General Philippe Leclerc de Hauteclocque's 2nd Armored Division, through which he participated in the Liberation of Paris and the Western Allied invasion of Germany.
He was the Deputy Information Officer to the French Prime Minister and Chairman of the Board of Directors of INRIA in 1967.
[2] He served as a government minister for fourteen consecutive years within the administrations of three French Presidents - Charles de Gaulle, Georges Pompidou and Valéry Giscard d'Estaing.