In 1963, Franck's photography career started following trips to the Far East, having taken pictures with her cousin’s Leica camera. Returning to France in 1964, now possessing a camera of her own, Franck became an assistant to photographers Eliot Elisofon and Gjon Mili at "Time-Life." By 1969 she was a busy freelance photographer for magazines such as "Vogue," "Life" and "Sports Illustrated," and the official photographer of the Théâtre du Soleil (a position she held for 48 years). From 1970 to 1971 she worked in Paris at the Agence Vu photo agency, and in 1972 she co-founded the Viva agency.