Dix was born in Wales in 1967. He studied in London where he first drew comics for Crisis and later cofounded PURR. He moved back to Wales in 1995 where he drew strips for The Guardian newspaper for many years. He collaborated with Si Spencer on the graphic novel, Klaxon, in 2015 and with Jim Broadbent on Dull Margaret in 2018. The Idris File is his first solo graphic novel. He lives in Hay on Wye.