Helen Scales, PhD, is a marine biologist based in Cambridge, England. Her doctorate involved searching for giant, endangered fish in Borneo; she's also tagged sharks in California and once spent a year cataloging all the marine life she could find surrounding a hundred islands in the Andaman Sea. Helen is now a freelance researcher and broadcaster; she appears regularly on BBC Radio 4, Sky News, and the BBC World Service, and has presented documentaries on topics such as whether people will ever live underwater, the science of making and surfing waves, and the intricacies of sharks' minds. She is also scientific advisor to the charity Sea Changers, a fellow of the Royal Geographical Society, and a tutor at the University of Cambridge.