John Duncan is a research scientist working at the universities of Cambridge and Oxford, and a fellow of the Royal Society and the British Academy. Brought up on farms in Staffordshire and Devon, he studied psychology and physiology at Oxford and has spent most of his subsequent life in Cambridge, with periods working at the University of Oregon and the National Institute of Mental Health near Washington, DC. He is known for his frontal-lobe theory of human intelligence, which has been covered in the media worldwide – including the BBC, ABC News, the New York Times, Washington Post, Science and New Scientist. How Intelligence Happens, his first book for a popular audience, is based on his 30-year research programme linking human mind to brain. He lives in a small village close to Cambridge.