Francesca Simon spent her childhood on the beach in California and started writing stories at the age of eight. She wrote her first Horrid Henry book in 1994. Horrid Henry has gone on to conquer the globe; his adventures are published in 27 languages and have sold millions of copies worldwide.

Francesca has won the Children's Book of the Year Award and been a judge for the Guardian Children's Fiction Prize and the Roald Dahl Funny Prize. In 2009, in one of the proudest moments of her career, Francesca was awarded a Gold Blue Peter badge.

Francesca is also a passionate ambassador for children's literacy and is a trustee of the World Book Day charity. She lives in North London with her family.

Visit Francesca's website at www.francescasimon.com and keep up-to-date with Horrid Henry at www.horridhenry.co.uk. You can also follow her on Twitter @simon_francesca

Tony Ross was born in London and studied at the Liverpool School of Art and Design. He has worked as a cartoonist, a graphic designer, as the Art Director of an advertising agency, and as Senior Lecturer in Art at Manchester Polytechnic.

Tony is one of the most popular and successful children's illustrators of all time, best known for illustrating Horrid Henry and the works of David Walliams. Tony's books have been translated into 40 languages in over 100 countries. He lives in Macclesfield.