Paul Chrystal attended the Universities of Hull and Southampton where he took degrees in Classics. For the next thirty-five years he worked in medical publishing, much of the time as an international sales director for one market or another while latterly creating medical educational programmes for the pharmaceutical industry. He worked for companies such as Churchill Livingstone, Wiley-Blackwell, CRC Press, Academic Press and Elsevier.
Sandra Hempel is a medical journalist whose work has appeared in the Times, the Sunday Times, and the Guardian. The author of The Inheritor's Powder and the award-winning The Strange Case of the Broad Street Pump, she lives in London.
