Terry Denton, Beloved Illustrator of Treehouse Series, Dies Aged 76

Beloved Australian children’s author and illustrator Terry Denton, best known for his collaborative work on the multimillion-selling Treehouse series with Andy Griffiths, died on Monday, September 21, 2026, at the age of 76, surrounded by his family. His literary agency Curtis Brown and publisher Pan Macmillan announced the death, which drew widespread tributes from the literary community.

A Three-Decade Partnership That Redefined Australian Children’s Literature

For thirty years, Terry Denton shaped the literary landscape of Australian children’s books through an enduring partnership with author Andy Griffiths. Their collaboration began in 1997 with Just Tricking!, establishing a creative dynamic that would eventually span more than a dozen wildly popular illustrated novels. Together, Denton and Griffiths built global profiles as literary pranksters, a creative pairing that Griffiths described as a match made in heaven defined by mutual respect and a complete absence of ego in their professional lives.

That creative engine reached its zenith with the Treehouse series, launching with the 13-Storey Treehouse. The books went on to sell more than 10 million copies worldwide. The cultural footprint of the series broke domestic publishing records when the 78-Storey Treehouse became the fastest-selling book in Australian history upon its release in 2016.

“Working – and playing – with Terry over three decades has been an incredible honour and a pure delight. I’ve never laughed so hard as I did when working with him, whether in the writing room or on stage. He was a true clown and much beloved – both in real life and as a character in the Treehouse series. Jill and I will miss him greatly.”

Andy Griffiths, Author and Collaborator, via The Age

Family and Publishing Tributes Highlight a Lasting Legacy

Denton died on Monday following a period of declining health in recent years, prompting his family to step back from public appearances so he could spend his final time surrounded by loved ones. In a statement issued through his agency Curtis Brown, his family reflected on the immense joy his creative output brought to young readers across the globe.

“Dad gave joy to millions of children around the world and after all those stories and all those lives he touched, he always came home to us. We are so grateful that his stories will continue to live on, bringing wonder, laughter and comfort to generations yet to come – and most especially to his beloved grandchildren, who will grow up knowing him through the magic he left behind.”

The Denton Family, via The Age

Pan Macmillan Australia deputy publishing director Claire Craig remembered Denton as an icon known across the country as prodigiously talented, truly delightful and very funny. Authors and booksellers alike shared their grief across social media, with author Amie Kaufman writing that we have lost a legend, while Melbourne’s Readings bookshop noted that Australian children’s literature had lost one of its foundational figures.

An Extensive Career Across Television and Picture Books

Before his defining work with Griffiths, Denton had already established a prolific career, authoring and illustrating more than 30 of his own books. Born and raised in Melbourne as the second youngest of five brothers, his artistic talent earned early recognition, including the Children’s Book Council of Australia Picture Book of the Year Award in 1986 for Felix and Alexander.

Terry Denton, Beloved Illustrator of Treehouse Series, Dies Aged 76 — Photo: Theguardian

Denton’s creative reach extended far beyond traditional publishing. He created the popular Gasp! series, which was adapted for television in 2011, and contributed to the development of the iconic Australian children’s television program Lift Off, designing the program’s signature EC doll. As an illustrator, he also collaborated extensively with other prominent Australian authors, including Mem Fox, Paul Jennings, Alison Lloyd, and Gillian Rubinstein.

Survivors and Final Chapter of the Treehouse Series

Reflecting on their final days working together, Griffiths noted that the duo had fulfilled a long-running creative ambition before health concerns intervened. We always joked that we would go to 13 books with the Treehouse series, and after we finished number 13, the end came, Griffiths observed.

Photo: Theage

Denton is survived by his wife, Kristen, their children Max, Imogen, and Eve, and their grandchildren Georgia, Lucy, Charlie, Alfie, and Felix, leaving behind a legacy cemented in the bookshelves and classrooms of millions of readers worldwide.