Professor Helen McGrath has worked for many years as a psychologist in both a hospital setting and in private practice. She is currently an adjunct professor at both Deakin University and RMIT University.

She is the author/co-author of twenty-two books for psychologists, other professionals and the general community, including Bounce Back!, Difficult Personalities and Friends.

Hazel Edwards, O.A.M., is an award-winning author of books for children and adults. Her beloved picture book series 'There's a Hippopotamus on Our Roof Eating Cake' has been hugely popular for almost forty years, inspiring a musical stage production and a short movie. Hippo gets lots of fan mail.

Awarded the Australian Society of Authors’ Medal in 2009, Hazel has been nominated three times for the Astrid Lindgren Memorial Award.