Ursula Moray Williams was an English children's author of nearly 70 books for children. Adventures of the Little Wooden Horse, written while expecting her first child, remained in print throughout her life from its publication in 1939

Catherine Rayner is an author and illustrator of children's picture books. She studied Illustration at Edinburgh College of Art where, for her final degree show, she created what would go on to be her debut picture book.

She is winner of the Kate Greenaway Medal and Booktrust's Best New Illustrator Award, and, in 2010, was the inaugural illustrator in residence at the Edinburgh International Book Festival.

As well as producing award-winning picture books, Catherine also exhibits her artwork in galleries all over the world and illustrates her own range of greeting cards.