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.

Jim Kay won the Kate Greenaway Medal in 2012 for his illustrations in A Monster Calls by Patrick Ness. He studied illustration at the University of Westminster, and worked in the Library & Archives of Tate Britain and then as an assistant curator of botanical illustrations at the Royal Botanic Gardens at Kew before returning to producing art full-time. After a one-man exhibition at Richmond Gallery he was approached by a publisher and his freelance career began. Alongside his illustration work, Jim has produced concept work for film and television, and contributed to the group exhibition Memory Palace at the V&A Museum in London. The Illustrated Edition of Harry Potter and the Philosopher's Stone was published to international acclaim. Bloomsbury has commissioned Jim to illustrate all seven books in J.K. Rowling's classic series. Jim lives and works in Sussex with his wife.

Massive year-round marketing campaign leads from Harry Potter Book Night in February through to Back to Hogwarts and huge Christmas gifting activity in the autumn