Tony RossAnthony Lee Ross (born 10 August 1938) is a British author and illustrator of children's picture books. In Britain, he is best known for writing and illustrating his Little Princess books and for illustrating the Horrid Henry series by Francesca Simon, both of which have become TV series for Milkshake! and CITV respectively based on his artwork. He also illustrates the works of David Walliams. He has also illustrated the Amber Brown series by Paula Danziger, the Dr.