Martin Kemp is Emeritus Research Professor in the History of Art at Oxford University. He has written and broadcast extensively on imagery in art and science from the Renaissance to the present day. He speaks on issues of visualisation and lateral thinking to a wide range of audiences. Leonardo da Vinci has been the subject of books written by him, including Leonardo (Oxford University Press 2004). He has published on imagery in the sciences of anatomy, natural history and optics, including The Science of Art: Optical Themes in Western Art from Brunelleschi to Seurat (Yale University Press).