[1] He then worked as a freelance illustrator for advertising from 1983 when he met John Higgins who was writing a music magazine comic story, The Bizniz.

Sullivan ended up colouring Steve Yeowell's art on the story and later Higgins introduced him to the editors at Marvel UK.

[3] and has subsequently been published in a number of titles including: Transformers, ThunderCats, Death's Head, RoboCop, TekWorld, Thunderbirds (from 2000 to 2005)[4] and 2000 AD.

He produced line artwork for alternate issues of Doctor Who DVD Files and worked as pencils/inks artist on The Amulet of Samarkand graphic novel for Hyperion Books which was published in late 2010.

Sullivan plays the saxophone and toured the UK as part of a Roxy Music tribute band for over a decade before quitting in 2015.