Baccalaureat (1935), studies of unfinished letters in Lausanne. In 1936, Dudan begins in Paris as interprets, but the war imposes the return in Switzerland to him. He lives then in Paris (1945-1964) and Canada (1964-1982) before returning definitively to Switzerland.

One owes him more than 1700 songs, of which most known are the coffee with milk in the bed (1939), Mélancolie and Clopin-Clopan (1946).

It also turned in more than thirty films. Price of honor of the Charles Cros Academy for her disc Ballade of all times (1977) and price Robert Brasillach (1981). Its style approaches that of Charles Trenet.