(b. 11/3/1945, France) Jean-Yves was born in Toulouse and studied Fine Arts in Lyon. After completing his studies, he found employment in the retouching studio of Lug publishers. Here, he discovered American and Italian comics. His first series, 'Sammy Sam', was published from 1965 in magazine Pim, Pam, Poum, Pipo. For this series, he took on the penname Jym. Next, he took over the series 'Pugacioff' from the Italian artist Giorgio Rebuffi in Maxi Pipo, which was later illustrated by Amouriq and Yves Chantereau. He also created the little indian 'Plume'.With scenario writer Navarro, he made series like 'Oum le Dauphin', based on the television series, and 'Blek le Roc' ('Il Grande Blek'). For this last series, he changed from a humorous to a realistic style. He was additionally a productive cover artist for the Lug publications. Under the pseudonym John Milton, he worked for Nova, where he made several comics with superheroes like 'The Silver Surfer', 'The Fantastic Four' and 'Spider-man'.In 1980, he started the saga 'Mikros' in Mustang and Titans, and made a comic adaptation of the television series 'Blackstar'. Continuing his work on superheroes, he illustrated stories with 'Cosmo' and 'Photonik', and created 'Epsilon' and 'Kronos'.Starting in 1987, he associated himself with François François Corteggiani, with whom he made 'l'Archer Blanc' and 'Noël et Marie'. In 1989, Mitton took over 'De Silence et de Sang' from Marc Malès. Next, he began a series about the Gaulish-Roman time: 'Vae Victis' and a comic about pirates, 'Les survivants de l'Atlantique'. In 1994, he produced his series 'Chroniques Barbares', a saga about a tribe of vikings. Additionally, he made 'Quetzalcoatl' for Glénat and several comics for the Scandinavian magazine Fantomen, such as 'Herman Storm' with text by Eirik Ildahl.
As a scriptwriter, he has worked with Frank Bonnet ('Attila... mon amour') and Michel Rodrigue ('Les Truculentes Aventures de Rabelais'). For the advertising agency Jet Stream, Mitton produced 'Papoose' with scriptwriter Chantelouve in 2002. His series 'Colorado' was published by Carpe Diem.