Cressida illustrates the Hiccup books herself, but also writes picture books that other people illustrate. She has had 20 books published, 10 Hiccup fiction titles, and ten picture books, including the Emily Brown books, illustrated by Neal Layton. She has just finished writing the tenth Hiccup book, How to Seize a Dragon's Jewel.
The film of How to Train Your Dragon came out in 2010. There will be three more films, the sequel to be released in late 2013. There will also be a How to Train Your Dragon TV series, and an arena show. Cressida won the Nestle Children's book award in 2006 and the How to Train Your Dragon film has been nominated for the 2011 BAFTAs and the Oscars.