Andrew Kelly is the Yarra Riverkeeper, part of an international organisation of Riverkeepers.

He has written numerous books for children and adults.

Mark Jackson is an illustrator based in Melbourne. He has co-illustrated several books with his wife, Heather Potter, and their work has been featured in several exhibitions. His books, including The Snow Wombat (written by Susannah Chambers), Waves (written by Donna Rawlins and co-illustrated by Heather Potter), Platypus (written by Sue Whiting), Bilby Secrets (written by Edel Wignell) and Stuck! (written by Charlotte Calder) have been shortlisted for multiple awards, including the Speech Pathology Australia Book of the Year Awards and the Children's Book Council of Australia Awards.

Heather Potter is an illustrator based in Melbourne. She has co-illustrated several books with her husband, Mark Jackson, and their work has been featured in several exhibitions. Their first Walker Book together was picture book Not Like Georgie by Scott Hatcher, 2008. Heather also illustrated the verse novel Pearl Verses the World in 2009 by Sally Murphy, which won the Children’s Book Category for the Indie Book of the Year Awards and Honour Book, Younger Readers category, Children’s Book Council of Australia Book of the Year Awards, 2010. Her latest book with Walker is Nanna’s Button Tin, written by Dianne Wolfer.