I Used to Know That

Chris Waring was born in London. After a degree in Mechanical Engineering at Imperial College London and a short yet disastrous career as a headhunter, he became a maths teacher. Since then he has taught small children and Oxbridge candidates and everybody in between. He has written I Used to Know That: Maths (2010) and From 0 to Infinity in 26 Centuries (2012) for Michael O'Mara Books. He lives in York.