Leon Kreitzman is a consultant and biologist and the author of 24 Hour Society.
'A fascinating mine of information ... this is essential reading.' The Independent 'An intriguing and highly detailed account of circadian rhythms.' Observer 'Foster is a pioneer who takes readers on a captivating journey ... it is time that the profound knowledge of clock research reaches everyone in society; this book does an excellent job in this campaign' Nature 'Humans, like all other living creatures, live in and by time, but increasingly in our 24/7 society the deep evolutionarily conserved rhythms on which our lives have depended have become disturbed by a digitized clockwise form of time. In this accessible and richly informed book Russell Foster and Leon Kreitzman explore the meaning, significance and mechanism of these ancient biological clocks in our own day-to day lives and those too of other life forms on earth.' Professor Steven Rose