Matz aka Alexis Nolent is a French writer. He writes scripts for videogames and has also written a novel and, under the Matz pen-name, a number of comics. His graphic novel, Du Plomb Dans La Tete, AKA Headshot was adapted into the 2012 film, Bullet to the Head.
Jean-Marc Rochette is a painter, illustrator and cartoonist. He has worked across a variety of projects and genres, from science fiction comics to children's cartoons - and including adaptations of Voltaire's Candide and Homer's Odyssey - but Snowpiercer remains the work by which he is most popularly known.