Jok was born in Buenos Aires (Argentina) in the seventies and has been working as a comic book artist since 1993. His work´s been published in the US (Image, Massive, Heavy Metal, Scholastic, Capstone, Bad Bug, Alien Books and soon in Mad Cave), England (Markosia, David Lloyd´s Aces Weekly), Italy, France (Mosquito, Delcourt), Spain, Germany (Splitter), Denmark, Cyprus, Canada, China (Cixin Liu´s work adaptation), Brazil, Argentina and Uruguay. He runs a studio along with fellow comic book creators since 2001, splitting his time amongst several endeavors, including work-for-hire projects, creator-owned books, children illustration, attending conventions all over the world and not missing a match of his weekly soccer with friends and colleagues.