Claude Marin started his comics career at a very young age, when his talent was noticed by Marijac. Marin was invited to work for Marijac's magazine Le Coq Hardi. His first steps in the field were illustrating the 'Rouletabosse Reporter' comic, on scenarios by its creator Marijac, in 1946. Marin remained active for Le Coq Hardi until 1955, and among his most notable contributions were the series 'Le Père Noël' and 'Les Trois Mousquetaires du Far West'.
Marin was additionally active for other magazines, often edited by Marijac.
Starting in 1949, Marin also contributed many stories and cover illustrations to Flemish comics magazine Kleine Zondagsvriend, using both comic and realistic graphic styles. He was also present in Ketelbinkiekrant in Holland.
Between 1966 and 1975, he worked for the children's clothing shop Bambino, for which he set up Bambino Magazine. However, after a meeting with Michel Greg, Marin returned to comics in 1975 with a revival of 'Père Noël', now renamed to 'Croûton'. Along with Greg, Marin started the 'Frère Boudin' series, about a friendly monk, in Achille Talon Magazine in 1976.
It was in 1979 when Claude Marin realized his childhood dream: drawing Disney comics. In that year, Marin started working for Le Journal de Mickey, for which he illustrated many stories with 'Mickey Mouse'.