Russell Foster is Professor of Circadian Neuroscience and the Head of the Department of Ophthalmology at Oxford University. His research spans basic and applied circadian and photoreceptor biology. For his discovery of non-rod, non-cone ocular photoreceptors he has been awarded the Honma prize (Japan), Cogan award (USA), and Zoological Society Scientific & Edride-Green Medals (UK). He has also written several books, such as Rhythms of Life , co-authored with Leon Kreitzman (Profile Books, 2004) and Sleep: A Very Short Introduction (Oxford University Press, 2012).