Alex Bellos is the author of the bestselling popular maths books Alex’s Adventures in Numberland and Alex Through the Looking-Glass. He is the Guardian’s maths and puzzles blogger and a regular science presenter on BBC Radio 4. He was the Guardian’s foreign correspondent in South America, where he wrote a book on Brazilian football, and was Pelé’s ghost writer.
Edmund Harriss is a well-known British mathematical artist. He has a PhD in maths from Imperial College, London, and is currently an assistant professor at the University of Arkansas. His research has appeared in Nature and the Proceedings of the National Academy of Science. He has led workshops at the Museum of Mathematics in New York and is Academic Director of Epsilon Camp, a summer camp in the US for mathematically gifted 8-11 year olds.