Hendrik is an Australian author best known as one half of the creative duo ""Hendrik & Estella"". He writes across picture books and chapter books, with series including Blue Fork Rhymes, Sink Detectives, Bear Rhymes and Dean's Epic Dreams. His work for older readers focuses on character, problem-solving and the small choices that shape who we become. In stories such as Old Warty's Promises he pairs pacey chapters with clear, readable prose and gentle humour, inviting readers to think, laugh and cheer for teams, friends and fair play. Estella is an Australian illustrator known for expressive, reader-friendly artwork for children's books. As one half of ""Hendrik & Estella"", she works primarily in pencil, ink and watercolour, refining digitally to keep compositions clean and narrative beats clear. Her series credits include Blue Fork Rhymes, Sink Detectives, Bear Rhymes and Dean's Epic Dreams, where she focuses on character acting, humour and visual pacing that supports growing readers. Alongside her book work, Estella develops select pieces into surface-pattern designs for textiles and soft furnishings through partners such as Spoonflower and Redbubble.