10 June 2015 Last updated at 14:14 BST
The Children's Laureate is a well known writer of children's books who promotes and encourage children's interest in books, reading and writing.
A new one is chosen every two years.
He takes over from author Malorie Blackman who held the post before.
Illustrator and author Chris Riddell, who created the Goth Girl series, has been named as the new Children's Laureate until 2017.