Marshall was born in Cedars-Sinai Medical Center, a hospital in Los Angeles on 13 September 1944. When his parents divorced, his father made sure that he receive an American education. He began studying Law, but he dreamed of becoming an actor. He later joined his mother in Paris. He began to take drama classes from Raymond Griard and later directed his first film, Potato, in France under the direction of Robert Thomas, adapted from the play's eponymoys Marcel Achard. He had already appeared in two films from overseas, the first was directed by his father, and the second by Vincente Minelli. Gérard Oury, Marshall's step father, offered him a role of a young English airman in La Grande Vadrouille, as a doctor in Le Coup du parapluie. Marshall had a long, though low-key, career as a character actor in French Cinema. On stage he starred in Croque-monsieur, Le Vallon , and Point de feu sans fumée. Marshall has also appeared in several television series.　　He died in Caen, France, aged 60, of cancer [2]; he was survived by his mother.