Dr. Helen Scales is a marine biologist, diver, broadcaster and author. She has studied many parts of the oceans, from coral reefs in Borneo to the mangroves of Madagascar. She got to know the Great Barrier Reef working as a divemaster. Among her books about ocean life is the bestseller Spirals in Time. Helen presents the Earth Unscrewed podcast and appears regularly on BBC radio as an oceans expert. She advises the charity Sea Changers and teaches at Cambridge University. For part of the year she lives in Cambridge, England and the rest on the Atlantic coast of France.

Lisk Feng is an award-winning illustrator from China, who now lives and works in New York. She graduated from the MFA Illustration Practice from Maryland Institute College of Art, and has received awards from the Society of Illustrators and Communication Arts, among others. She is also the illustrator of Everest.