J.K. Rowling is best known as the author of the seven Harry Potter books, which were published between 1997 and 2007. The enduringly popular adventures of Harry, Ron and Hermione have gone on to sell over 500 million copies, be translated into over 80 languages and made into eight blockbuster films. Alongside the Harry Potter series, she also wrote three short companion volumes for charity: Quidditch Through the Ages and 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. J.K. Rowling collaborated with playwright Jack Thorne and director John Tiffany to continue Harry's story in a stage play, Harry Potter and the Cursed Child, which opened in London in 2016 and is now playing in Europe, North America and Australia. In the same year, she made her debut as a screenwriter with the film Fantastic Beasts and Where to Find Them, the first in a series featuring Magizoologist Newt Scamander, which was inspired by the original companion volume. J.K. Rowling has also written a standalone novel, The Casual Vacancy, and is the author of the Strike crime series under the pseudonym Robert Galbraith. Both have been adapted for television. She has received many awards and honours, including an OBE and a Companion of Honour for services to literature and philanthropy. She lives in Scotland with her family.

Emily Gravett was born in Brighton. After leaving school with few qualifications, she spent eight years living on the road before taking the BA illustration course at Brighton University. She 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 Award for Illustration 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 with her daughter, partner and two rats.

Massive year-round Potter marketing campaign leads from Harry Potter Book Night in February, followed by huge activity in the autumn through to Christmas gifting