Helen Scales, PhD, is a marine biologist, writer, and public broadcaster. She is the author of Spirals in Time: The Secret Life and Curious Afterlife of Seashells and Eye of the Shoal: A Fishwatcher's Guide to Life, the Ocean, and Everything. She has written for National Geographic, the Guardian, New Scientist, BBC Wildlife Magazine, and BBC Focus, among others, and also presents the Earth Unscrewed podcast. She teaches marine biology and science writing at Cambridge University and advises the marine conservation charity Sea Changers. She divides her time between Cambridge, England, and the French coast of Finistère.