He lived for eighteen years in Katanga and returned to Belgium to work in different professions.

He was fond of Japanese martial arts, and practiced judo, kendo, then iaido.

[2] Michetz was one of the original members of Le Gang Mazda [fr] (Mazda Gang), a fictionalized comic book series about a trio of cartoonists, together with Christian Darasse [fr] and Bernard Hislaire.

[3] He started his career at Studio Graton and then drew for magazines Tintin[4] and Spirou.

His best-known creation is the Kogaratsu series, about a rōnin, which he created together with Serge Bosmans [nl] (Bosse) in 1983.