Kate Kitagawa (Author) Dr Kate Kitagawa is one of the world's leading experts on the history of mathematics. She earned a PhD from Princeton University, taught history at Harvard University and conducted research in the UK, Germany and South Africa. Her first book was a national bestseller in Japan, and she has been named one of the 100 most influential people in Japan by Nikkei Business.Timothy Revell (Author) Dr Timothy Revell is a journalist and lapsed mathematician. He is currently the Executive Editor for New Scientist and is based in London. As a reporter and editor, he specialises in technology and mathematics, covering everything from artificial intelligence to the Abel prize. He appears regularly on WNYC's Science Friday, as well as on other podcasts and radio to talk about the latest developments in science. He has a master's degree in mathematics and a Ph.D. in computer science. His first book was Man vs. Maths.