Tomoko L. Kitagawa (Author) Dr Tomoko L. Kitagawa is a historian specialising in the mathematical cultures of Europe, East Asia, and South Africa at Oxford University. After a stint as a diplomat at the United Nations in New York, she received her PhD in history from Princeton University. She has taught at Harvard University and held research positions at UC Berkeley, University of Cambridge and the Max Planck Institute. Her first book, Japanese History Abroad (2012), was a national bestseller in Japan. She was selected as one of the '100 most influential people in Japan' by Nikkei Business Publishing and one of the '100 most amazing Japanese women' by Japan's leading publisher, Shincho. Based in Oxford, she works as an occasional broadcaster, with appearances on Netflix, CNN, the History Channel, and the BBC. Timothy Revell (Author) Dr Timothy Revell is a science journalist and lapsed mathematician. He currently works as Culture and Comment Editor at New Scientist. As a reporter and editor, he specialises in technology and mathematics, covering everything from artificial intelligence to the Abel prize. He also currently runs New Scientist's diversity internship scheme. He often appears on the BBC radio show 'The Naked Scientists', including in a slot answering listener's questions about mathematics.