Clive Hahn is Professor of Anaesthetic Science in the Nuffield Department of Anaesthetics at the University of Oxford, and has recently retired as a Consultant in Clinical Measurement in the Oxford Radcliffe Hospitals NHS Trust. He trained in Manchester, Sheffield and Oxford, and originally took up NHS posts in the Oxford United Hospitals before becoming a University Lecturer in Anaesthetics, and then gaining his Professorial appointment and finally becoming Head of the Oxford Anaesthetics Department in 2002. He was elected as a Fellow of the Academy of Medical Sciences in 2000, and was awarded the Gold Medal of the Royal College of Anaesthetists in 2001. His major research interest lies in the field of cardiopulmonary gas exchange in the sick and healthy lung. His interest in molecular sensors grew out of the frustration of not being able to measure gases of clinical interest with any degree of accuracy or precision, especially when anaesthetic gases and vapours are present. He still retains an active research and development interest in gas and anaesthetic agent sensors, and in 2006 was awarded an EPSRC follow-on grant co-funded by ERAF. He is the author of numerous articles on cardio-respiratory gas exchange, clinical measurement, blood-gas analysis, and respiratory gas/anaesthetic agent sensors.