Greg started out as a comic artist at 2000AD on Judge Dredd in 1989 which then led on to concept design work for film,television and the games industry on AAA titles. His work may be best known in the USA for Blizzard and Magic The Gathering and illustrating the book The Horror Stories of Robert E Howard.

He regularly works with great film directors as a concept artist and was the lead costume concept artist for the Oscar winning costume designer Mayes C. Rubeo illustrating Brad Pitts outfits for World War Z. Amongst many other high profile film and TV projects. He was a founder and co-director of visual effects company ARK VFX, a boutique animation studio which evolved into a directing partnership. This led to directing various television commercials and most notably a music video for the band, Muse.

His recent book Judge Dredd: Dark Justice saw him return to his traditional roots and received many accolades for its intricate hand painted artwork.
He works remotely from a cosy and fully facilitated studio but also works in house when the project requires it.

In 2016 he completed working as Principal concept artist on Dead Island 2 and recently completed two months concept design work on Hellboy (2019) .