Dr Helen Scales is a marine biologist, writer, and documentary maker focusing on connections between people, science, and the living world. She is the author of the Guardian bestseller Spirals in Time, and writes for National Geographic Magazine, the Guardian, and New Scientist, among others. She teaches at Cambridge University and is science advisor for the marine conservation charity Sea Changers.

Sonia Pulido is an artist living in a seaside village close to Barcelona. Her illustrations have appeared in publications globally, including The New Yorker and The New York Times.