Dawn McMillan is a writer of fiction, non-fiction, poetry, and storybooks for children. She is the author of the hilarious bestselling I Need a NEW BUTT! series, as well as the adorable Doctor Grundy's Undies, Seagull Sid and the Naughty Things His Seagulls Did!, and many more wonderful children's books. Dawn lives in Waiomu, New Zealand, where she writes from her garden studio with a view of the sea.

Ross Kinnaird first began illustrating children's books in 2002 with the popular Why Do Dogs Sniff Bottoms? by Dawn McMillan, which won the Children's Choice Award at the New Zealand Post Children's Book Awards. He has since gone on to illustrate dozens more books that include the popular I Need a NEW BUTT! series, as well as Doctor Grundy's Undies and Seagull Sid and the Naughty Things His Seagulls Did!, 50 Body Questions, and many more. Ross also created the animated poem "Smaller," winner of the People's Choice Award at the World Parkinson Congress. He lives in Auckland, New Zealand.