Jok was born in Buenos Aires (Argentina) and has been working as a comic book artist since 1993. His work´s been published in the US, England, Italy, France (Mosquito, Delcourt), Spain, Germany, Denmark, Cyprus, Canada, China, 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.