Russell G. Foster is Professor of Circadian Neuroscience at the University of Oxford and a leading expert on the neuroscience of biological time. He is a Fellow of the Royal Society. Leon Kreitzman is a writer and broadcaster, a widely respected futurologist, and author of The 24 Hour Society.

In Rhythms of Life, also published by Profile, Russell Foster and Leon Kreitzman introduced the science of chronobiology and circadian rhythms to the general public. Their influential book was a finalist for the Galileo science book prize in Padua and short-listed for the US independent publishers science book award. Rhythms of Life has been published in the UK, USA, Italy China, Japan, Taiwan