Garth Nix was born in 1963 in Melbourne, Australia. A full-time writer since 2001, he previously worked as a literary agent, marketing consultant, book editor, book publicist, book sales representative, bookseller, and as a part-time soldier in the Australian Army Reserve.

Garth's books include the award-winning young adult fantasy novels Sabriel, Lirael, Abhorsen and Clariel; the dystopian novel Shade's Children; the space opera A Confusion of Princes; and a Regency romance with magic, Newt's Emerald. His fantasy novels for children include The Ragwitch; the six books of the Seventh Tower sequence; the Keys to the Kingdom series; and the Troubletwisters series and Spirit Animals: Blood Ties (co-written with Sean Williams).

More than five million copies of his books have been sold around the world, his books have appeared on the bestseller lists of the New York Times, Publishers Weekly, the Times and The Australian, and his work has been translated into forty-one languages. He lives in a Sydney beach suburb with his wife and two children.

Sean Williams is a multi-award-winning, #1 New York Times best-selling author for readers of all ages. With over four million published words, in the form of series, novels, short stories and poems that have been translated into multiple languages for readers around the world, he has worked with visual artists, dramaturges, composers and other writers on collaborative works that include stories set in the Star Wars and Doctor Who universes, original series created with Garth Nix, and a science-fiction musical performed at the National Museum in Canberra.

In 2017, he was the recipient of the Australian Antarctica Division's annual Arts Fellowship. His most recent novels Impossible Music and Her Perilous Mansion were nominated for the Ethel Turner Prize for Young People's Literature and the Patricia Wrightson Prize for Children's Literature respectively. Both are Children's Book Council of Australia Notable Books. As well as being a senior lecturer at Flinders University, he writes articles about creative writing; composes music that has been released internationally and commissioned for exhibitions, live performances, and the stage; and cooks a mean Brussels sprout.