His father, an artist himself amazed Clayton with a picture of a car he saw him draw.

He began drawing at 4 and at age 9 he was drawn into the world of comics with a copy of Uncanny X-Men #201.

After several rejection letters Clayton shopped his work around the convention circuit where he was hired by Marvel Comics.

He later worked on Alpha Flight, which was cancelled after twelve issues due to poor sales.

His work also includes assisting Chris Bachalo with finishing up the "Supernovas" storyline and doing art for Uncanny X-Men.