Sam McCullen is an illustrator and children's book author from the UK. His first picture book 'Billy Back-To-Front' was published by Hodder Children's Books in 2006. You can see more of his fantastic work on his website and blog.
His hilarious cat is called Billy, the photos make me laugh every time I see them! Billy is a bit of a celebrity as the photo of him with the cat nip was featured in the 2007 'Bad Cat' calendar.