J.K. Rowling is the author of the enduringly popular Harry Potter books. After the idea for Harry Potter came to her on a delayed train journey in 1990, she plotted out and started writing the series of seven books and the first was published as Harry Potter and the Philosopher's Stone in the UK in 1997. The series took another ten years to complete, concluding in 2007 with the publication of Harry Potter and the Deathly Hallows.

To accompany the series, J.K. Rowling wrote three short companion volumes for charity, Quidditch Through the Agesand Fantastic Beasts and Where to Find Them, in aid of Comic Relief and Lumos, and The Tales of Beedle the Bard, in aid of Lumos. She also collaborated on the writing of a stage play, Harry Potter and the Cursed Child, which was published as a script book.

Her other books for children include the fairy tale The Ickabog and The Christmas Pig, which were published in 2020 and 2021 respectively and have also been bestsellers. She is also the author of books for adults, including a bestselling crime fiction series.

J.K. Rowling has received many awards and honors for her writing. She also supports a number of causes through her charitable trust Volant and is the founder of the children's charity Lumos.

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Olivia Lomenech Gill has a first class degree in Theatre from the University of Hull and an MA in Printmaking from Camberwell College of Arts. She has built her career as a professional fine artist and has been exhibited at all the major London art fairs. Olivia's first professional illustration commission, Where My Wellies Take Me, written by Clare and Michael Morpurgo, was shortlisted for the Kate Greenaway Medal and won the English Association Picture Book Award. Olivia lives and works in north Northumberland in a timber studio she built by hand with her husband, a paper conservator. They also have a workshop in a nearby village, which houses Olivia's three-ton printing press.
Emily Gravett won the Macmillan Prize for Illustration with her first book Wolves, which went on to win the Kate Greenaway Medal and the Boston Globe-Horn Book Honor, and marked the beginning of an international career creating extraordinary and innovative books for children: Little Mouse's Big Book of Fears won the Kate Greenaway Medal for her a second time. Her own picture books are published in more than 20 languages and she has also collaborated with some of the most creative writers working today including Julia Donaldson, A.F. Harrold, and Matt Haig. She lives in Brighton, United Kingdom, with her daughter and partner.
Lisbeth Zwerger is the recipient of the Hans Christian Andersen Medal for her contributions to children's literature, among many other awards, and her work has been included in the New York Times Best Illustrated Books list. She has illustrated editions of many classic tales, including Alice's Adventures in Wonderland, The Wizard of Oz, The Little Mermaid, A Christmas Carol, and several tales by the Brothers Grimm. She lives and works in Vienna, Austria.